Are you saying there aren't people in the US who fervently believe in what the Old Testament preaches?  You arbitrarily assume that "contemporary Christianity" eschews the teachings of the Old Testament when anyone who has studied history or read the Old Testament can plainly see it is the foundation for so-called contemporary Christian and Christian militarism.  Did you pay any attention to the religious agenda in the Bush wars?  Did you pay any attention whatsoever to the last 20 months? How many millions voted for Trump and his evangelical side-kick, Pence? Wake up.

Oh, and I'm not agnostic; I'm atheist.  I'm not arguing for any religion, period. I don't agree with many of the tenants of Islam or that of any religion that advocates oppression and death to believers and non-believers alike. But your argument ignores those who practice what you would call "contemporary Islam"; those who do not adhere to the dangerous precepts that you--and I--find so objectionable.