Unless, of course, since you believe Christianity is the Truth, that all other "wicked cults" don't deserve the protection of the First Amendment.
Look, the souls of the believers in those other religions are going to be damned without God's grace. But that does not mean that they should not be allowed to do so. Free will and all, remember? Or should we, as FRSaint Ann says, invade and convert them by force?
And before you claim that I sound like Cain, I do. The only soul I am responsible for is my own. I only strive to do good works and be a good example rather than be full of hate and spew venom.
Mohammed was SO much more clever than Adolf Hitler.
If only Hitler had declared Nazism to be a religion, and he its prophet, he could have established "Nazi temples" across the USA in the 1930s, blasting the Horst Wessel song from loudspeakers.
And you would have defended him, even as "a handful of bad Germans" stoked the furnaces of Dachau.