In a word, no.

A denomination is a branch off the main trunk, like in Christian. The title "Christian" holds many denominations like Roman Catholic, Protestant and then Protestant has more branches like Methodist, Baptist, 2 divisions of Church of Christ, Lutheran, Episcopalian, etc.

Religion is the practice of beliefs of either/or the main trunk of the tree and the differences between the denominations.

I'm not sure, but I would say tha Islam also has different "denominations" or factions. Some believe they should kill the "infidel," those that don't believe in Islam and those that don't believe they should go out and kill everyone that isn't of that faith.

Anyone that knows whether I'm right or not can correct me. Just don't bite my head off! LOL