It's not uncommon for a saved person to find themselves in very difficult times and believe God has abandoned them, or to think perhaps more is needed, and to turn to strange things to find help. That may take the form of making money their idol, astrology, horoscopes, or even thinking maybe "they" are right and all/some/most gods are one and the same and get caught up looking for a way to draw on God by pursuing some false religion ideas. Those I've had personal experience with are always restored to a right walk with God. Their testimonies are always very similar; of having felt very confused during that time, unfocused, having felt conviction but either not recognizing it at the time or thinking it just their own worries. Yet at some point the indwelling Spirit gets through to them, they come to see the great error of their ways, they repent and restored and typically have a great hunger for the things of God and the Lord graciously has someone in or come into their lives at that point who will disciple them and set their feet firmly on the path of righteousness. Meanwhile, the unsaved who get caught up in those things, including those who "tried" Christianity, tend to either remain caught up in those things or dive in further. The idea a saved person can't get caught up in some false church, try some false ways, latch onto something ungodly, or such things is no different than those who claim a saved person can't commit suicide, get drunk, do drugs, carry on an affair, get divorced, or commit other sins that some claim no saved person can commit. Every saved person matures at a different pace, a different rate than others. Some are well discipled, some are not discipled at all. Some get into the Word themselves and begin to grow, some find confusion trying that. Some are freed from some sins while others are not instantly freed from the same sins. Some get caught up in "big" sins, others never commit another "big" sin. Being born again in Christ doesn't make anyone perfect or incapable of falling into sin, even the sin of thinking some false religion may have something right. We should be thankful our God doesn't leave us or forsake us but rather works in our lives to free us from sinful bondage and set us aright with Him.
Exodus 12:16 And in the first day there shall be an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save that which every man must eat, that only may be done of you.
A person can only blaspheme the Holy Spirit by refusing to be born again in Christ. A saved person cannot do that since they are already born again. Scripture does not say there are certain sins a saved person can never commit. There are those who believe once saved a Christian can't commit sin. Some actually believe they are living in perfect holiness, others simply call "little sins" mistakes or some other trivial word rather than acknowledge their sins for what they are. This isn't biblical. What is biblical is saved people sin, as First John is very clear about. Just because a person is saved doesn't mean they are immediately mature in the faith and can't be led astray, make mistakes or backslide into religious folly. One thing that would greatly help prevent such would be if we (Christians) would actually disciple other Christians, befriend Christians, help Christians. Instead, even in many of the "better" churches, Christians tend to form cliques which they are reluctant to let others into or they have their "church friends" while at church and worldly friends the rest of the time. This leaves us with many born again Christians weak in the faith, slow to mature, left in infancy, or even pushed away.
Following the biblical plan of salvation is indeed easy. Those who use the term "easy believism" are referring to the practice of presenting a watered down message and then prodding or pushing someone to repeat a "sinners prayer" and telling them that's all they have to do to be sure of heaven. In these cases there is typically no true, biblical understanding of sin, salvation, Christ or the biblical Gospel by those who repeat the "sinners prayer" (which is so often held forth more as a magic incantation than anything real). Praise God true, biblical salvation is easy. That's something I try to point out to those who attack Christianity claiming God wouldn't make it so hard to get to Him as Christianity does. The fact is, God made it very easy, with one Way to be right with Him. The idea that multiple ways to God and each person must find the one that's right for them is somehow easier is ridiculous. The Gospel is simple. Any difficulty is within us as we consider whether to follow the leading of the Spirit or our own flesh.
Exodus 12:12 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.
I've not heard a nationality of the killer mentioned but did read he's of mixed race and seems to have identified himself as black. It's been reported he was a supporter of the radical "black lives matter" movement which has called for the murder of police, whites and others. They also reported on his pro-Islamic, including radical Islamic views but never actually said if he was a Muslim or not.
Even before this "refuge crisis" it was estimated that in about 15 years Western European nations will find themselves being dominated by Muslims. European people in all their nations are not having enough children to even sustain their numbers. Meanwhile, Muslims are having 8.1 children per family; which will overwhelm the average 1.6 children of Europeans. By 2030 the Muslim population will be large enough to gain much political power by voting in most European nations. At the same time they will have a large population of young, fighting age men who are prepared to take Europe by force in the name of Allah. All this will likely lead to civil war across Western Europe with many native Europeans being slaughtered, some choosing to stand and fight, others attempting to flee, ironically, to Eastern Europe. America and Canada will likely be able to offer little assistance as both nations will have a large enough Muslim population at that time to cause chaos and fear within. Western man and Christianity are under severe threat and it's by design, not by accident. How anyone can hear the words and see the actions of Obama and not see he is taking a pro-Islam, anti-traditional America stance is beyond me. In some of our lifetimes we may see the destruction of the Christian West and the rise of parts of sub-Saharan Africa and Asia claiming the mantle of bastions of Christianity.
I've not seen a lot about the details but from what I have read it seems as if it's possible this pastor is one of those who began at that church preaching one way but then began moving his preaching, and the church, in a different direction. Some pastors want to move in a more Charismatic direction for the sake of attention, popularity and even earthly rewards. I don't know if that's the case with this particular pastor. None of the articles I've read gave any details as to whether others in the church attempted to take a stand as did the 103 year old woman or not. The articles focus upon the elderly woman without mentioning if she was the only one speaking out or not. It's possible this lady may have been the only person in the church with the courage to speak out.
A saved person can commit any sin an unsaved person can commit. A saved person can backslide and get caught up in some false religion just the same as a lost person can get caught up in such. The difference is, for the saved person the Holy Ghost will be working from within to restore them, turning them from error back to truth. It shouldn't be, but especially here in America this isn't all that uncommon.
There are many differences from one church to another but in our church members and non-members are treated alike. The main point of membership in our church is commitment. Those who choose to "join the church" are making a commitment to have a church home which they attend and support (not just speaking of money here). Membership is required to hold certain positions in the church, which is in large part a matter of that commitment factor. In our church membership is more about declaring a home church to be committed to. It's certainly not about proving ones salvation or being fully accepted as a brother/sister in Christ. It's a matter of fellowship and family commitment. No one is required to say they fully agree with the church constitution or statement of faith in order to join. Both are made clear in the "membership class" so everyone knows where the church stands and how the church operates. There is no requirement to sign anything giving 100% agreement to every point and detail within the church constitution and statement of faith to join.