Islam hasn't even killed 50,000 people. The religion really means to be peaceful, but you only hear about the extremists.
And I concur with Colla here. Religion is, overall, does the human race more harm than good.
50 000? Are you nuts? LOL
North-Africa used to be Xtian: they all disappeared somehow...
The Mid-East was partly Xtian/pagan.
Islam has killed so many, no onejust knows exact numbers.
As for Catholicism: yes many have been killed by Catholics under national agendas...so did protestants (it is not known to many people that they killed many of "witches" as well, etc.)
But did catholicism/xtianity start and continue to be a murderous religion? No
Islam's Mohammed - as far as history is concerned - was the very first islamic warrior. <-- he was a pedophile, liar (see haddiths), killer, and thief. That was the man who invented Islam.
If someone can prove to me Jesus was evil, then I will leave Xtianity. But I doubt that would happen....lol