How do christians view apostasy

[Godscreated]

SS, the scripture you show is what Jesus will do when He come back.
None of it pertains to the time prior to the 2nd Coming.

Hasn't stopped people from treating non Christians like second class citizens. Or are you going to pretend for a second that prohibiting Christians from marrying non-believers isn't a part of early Christian religion, dictated by St. Paul?

That's not true Paul urged Christians not to marry unbelievers so they would not have to go through tougher times than marriage can be. He also didn't want Satan to have a person that close working to draw them away from Christ.

GC

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I've never heard much of an explanation as to how someone who had sincerely accepted Jesus in the first place could be an apostate, but I suppose there will be someone along here to clarify that.

Here I am , God did not take away a person's free will when they were saved, they were saved in their free will and they can give up their salvation in free will. Some give it up believing they will always be saved, because of one thing bad doctrine. Scriptures never say one will always keep their salvation no matter what, it's actually clear that this is what can happen.
As for someone coming back to God, saying "I believe in Jesus," is no more valid than if someone says it for the first time and they do not have a repentant heart when they say "I believe in Jesus."

GC