If we're going to be relative with Christianity, let us think about the 2 most high profile extremist organizations of their respective religions. The Westboro Baptist Church, an organization which offends people by protesting at funerals and being wildly discriminatory, has a membership of 39. The Islamic State, an organization which offends by beheading Kafirs, as well as everybody who follows a different sect of Islam has a membership of 250,000. There are 2.4 billion Christians, where as there are 1.6 billion Muslims. Acting like there is any similarity is dishonesty with yourself.
Extremism is an Islamic problem, and should be talked about on this article, instead of an advertisement for Islam.