~ from email ~
The Bible teaches us about sin. It records the apostasies of professing believers and ministers. It tells us that some have false faith, so that they “believe” for a while and then fall away. Therefore, the fact that some professing believers and ministers turn from the Christian faith is what we should expect, since the Bible teaches us to expect it, so that the falling away actually illustrates the truth of the Bible.
If you are affected by people converting away from Christianity, then what about the many people who are converting to Christianity? It is irrational to be affected by other people’s conversion in either direction, but you could at least be consistent and be affected both ways, instead of being affected only by those falling away. You allow something to affect you in one direction while you do not allow the same thing to affect you in another direction. Your doubt is selective and arbitrary. You must doubt your doubt.
Those who fall away from the Christian faith are extremely stupid people. They defect for irrational reasons, and we can easily crush them in debate. It makes no sense to be affected by them.