Care to substantiate this? I guess those people who spent half their lives in Christianity then converted to another religion just didn't do their research? Jehova's Witnesses who studied daily, or people who went to Bible Schools or those who are former vicars and priests who have left the faith? All ignorant as mud.
First off, let me say that neither do I agree with the post to which your post responded, nor do I particularly agree with your second question. I don't think there's anything magically compelling about the Gospels that
COMPELS one to believe them. That smacks of a group of vacant-eyed children chanting: "
Join us... Be one of us... "
That said, I
do believe there's not a great amount of what
I would consider "due diligence" in the pews, or in the ranks of disbelievers. Of course, there is some, as well. "Due diligence" for me, though, probably differs from the definition of the other poster. For me, due diligence includes exegeting the texts with the help of peer-reviewed scholars, in the form of books, lectures, commentaries, articles, etc. It includes literary, historic, anthropological, form, literary, redaction, and other criticism, and little apologetics.
Most people I've come into contact with don't understand the context, circumstances, origins, or theological implications of the texts they either adore or dismiss. It's usually a case of either misapprehension or confirmation bias. I generally find the "exegesis" of Jehovah's Witnesses, for example, weak. I generally find the "analysis" of skeptics much too narrow. That being said, they're entitled to their beliefs, so long as they don't foist that belief upon the rest of us.
There are legitimate reasons for disbelief, and then there are a lot of knee-jerk reactions that lead to disbelief. There's A. LOT. of room for interpretation within the household of Christ.