Many people get upset when they hear muslims claiming that Jesus, Moses, Abraham, and other biblical heros, are muslims.
The confusion is in the the word muslim.
Muslim in arabic means a person who 'submits' to the worship of 'the one God'. (monotheism)
Thus, by that definition, Jesus and the Prophets in the Torah were all muslims. ......
But Christians worship the trinity. The father, son and holy ghost.