This is very very scaring, how to explain this with science, I believe they were fake atheist, but their brain is functioning in a religious way , there is something to research in the brain functioning and is must be related with evolution: http://www.youtube.com/watch?v=0IspK651RpY&feature=related, this too, http://www.youtube.com/watch?v=f5oh1F2UggY
You make several false assumptions here:
1) That atheism is the logical/rational position.
2) That people always arrive at the correct answer with correct reasoning.
3) That rational people cannot be persuaded to believe things that aren’t true.