Christians, not Satan, is the reason many leave the faith. Of course, Satan does not benefit from this because there is no Satan.
The author below spent time on a site I, also, look at, ex-christian.com. This site is teeming with testimonials from people who have left the faith or are on their way out.
The irony is that much of what Christians think they should say, or, are taught to say, to skeptics is exactly the wrong thing to say. First among the ways people are pushed out of the faith is by gay baiting. Acceptance of gays, and of gay marriage, is so widespread there are people with gay friends and relatives in virtually every church.
Those who talk anti gay to others think they are portraying themselves as being on a high moral plain. Those who hear anti gay talk, instead, think anti-gay Christians have low moral standards.
People are pushed out of Christianity by the circular reasoning. Once someone internalizes the absurdity of believing in God because God said he should, or, that God exists because God said he exists, telling that person to read the marvelous things God said about himself moves the effort backwards.
A third way to make a skeptic out of a believer is to put down women. This includes prohibiting women from holding church offices.
Discriminating against women is so widespread across the faith, one could say it is the Christian faith and not be far off the mark.