What is Islam?:
The name of the religion is Islam, which comes from an Arabic root word meaning "peace" and "submission." Islam teaches that one can only find peace in one's life by submitting to Almighty God (Allah) in heart, soul and deed. The same Arabic root word gives us "Salaam alaikum," ("Peace be with you"), the universal Muslim greeting.
Who is a Muslim?:
A person who believes in and consciously follows Islam is called a Muslim, also from the same root word. So, the religion is called "Islam," and a person who believes in and follows it is a "Muslim."