Islam is no different. Freedom of religion still applies. The terrorist groups that give Muslims a bad rep are not representative of Islam in general. For those Christians who do not understand, look at it this way: do the abhorrent actions of Westboro Baptist represent all Christians? No. Just like Christianity, Islam has many different sects and factions, some of which warp the basic tenets of the religion to their corrupt beliefs.
Also, did you know that “Allah” is just the Arabic word for “God?”