To add to what I said earlier, let me reply to two of your specific quotes...

"If people deconvert because they realize the Bible isn't true (or for another intellectual reason), then of course they would say that Christianity isn't true."

I take issue with the word "realize." How can someone "realize the Bible isn't true?" They may BELIEVE or FEEL the Bible isn't true, but you've smuggled their skepticism into your statement as if it's a fact. The Bible has never been disproved.

"If people deconvert because of the hypocritical behavior of others, then they would say that Christianity must not be true if people are acting this way."

And they would be wrong to draw that conclusion. It's a non sequitur. It would be like me saying that all (certainly the overwhelming majority of) those in prison today believe the earth is round and gravity is real...therefore, because the earth is flat and gravity isn't real. It's absurd.