Do Muslims go to heaven?
Question Do Catholics believe that people of other religions, such as Muslims, will go to heaven?
Answer Previously Rome taught that there is no salvation outside the Catholic Church and therefore Muslims would not be saved. Recently they changed their mind and the Catholic authorities assure Muslims (and members of other religions) that they will be saved if they follow their religion conscientiously. "The plan of salvation also includes those who acknowledge the Creator, in the first place among whom are the Muslims: these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind's judge on the last day." (Second Vatican Council, Lumen Gentium).
From the Christian perspective, we ought to take seriously the commission that our Lord entrusted to the church: "Go into all the world and preach the gospel to every creature. He who believes and is baptized will be saved; but he who does not believe will be condemned" (Mark 16:15,16).
http://www.justforcatholics.org/a135.htm