a lot of religions have been the basis for major and smaller wars, and all have their own way to be(come) a 'threat to mankind'.
but it's hard to see the difference between a religion and the way so called followers practice it. almost all religions preach peace and unity, but especially the latter is often used as an excuse to start wars.
islam isn't a threat to mankind, nor is christianity. the extrememist acting in name of any religion are the threat to mankind.
the poll is a bit provoking imo, because i'm pretty sure that you, hex, know just as well that islam AND christianity are both peaceful religions and that the religion itselves won't pose a danger.