Well, it's like using braces to make teeth straight....
You don't just grab the tooth and force it into where you want it to be, you ease it, a little at a time, first of all you convince them that religion is against things that pretty much anyone would be against.... Murder, Rape, Torture etc.
Then you start edging them into your line of thinking... What is murder, to answer that question you have to ask, what is life, and when does it start? Hence the motion begins...
Once you have peoples trust, and as long as you sound like you know what you are talking about, they will choose to believe you, because you were there, and the scientists weren't.
The same applies for teachers, they hold ni their hands the responsiblity for creating a free-thinking person, if they knowingly abuse that privilege then they not only abuse the children, but they abuse the entire name of 'teacher'.