"But as the subject is whether an entire racial demographic is or isn't culturally inclined to abduction and abuse of teenage girls, it is extremely important that I am 100% sure of the claim before accepting it."
LOX spot on, of course the answer is no,likewise not every Roman catholic is a sodomite or sexual abuser neither is every priest, in fact the majority of priests are not.
however the majority of muslims do regard women as second class citizens, that does not mean all of them do.
but if a majority do believe this because of their religion, I am inclined to condemn that aspect of their religion, THIS IS NOT RACIST.