I don't disagree with you at all that Islam is a very dangerous and violent ideology, but trying to replace it with Christianity is only going to make things worse. All religions that make dogmas of unprovable claims about the universe are the problem. Islam is a particularly militant and intolerant strain of faith, but all faith needs to be extinguished and replaced with the light of reason and logic. As long as people pretend their unproven guesses about how the universe works are absolute fact, there will be religious conflict. We need to abandon religion and embrace science. It's the only hope our species has if it wants to survive in a technological age.