Logic fallicy. Islam requires Muslims to follow sharia law, Christians are commanded to follow commandments, not laws but also have free will. Although homosexuality is considered a sin by most Christians it is not unpardonable or an automatic ride to hell, gays are to be treated as anyone else, same rights, respect etc. Christians view everyone as having sinned, even other Christians.
Sharia law calls for the death of homosexuals. To be fair, in most modern Islamic countries they do not carry it that far but in others just being branded as gay ends badly.
Unless you see Christians tossing homosexuals off of roofs or stoning them your comparison remains invalid.