Followers of islam are called muslims and they believe that there is only one god.
Allah
Muslims call their god, Allah (The Arabic name for God).
God, the Creator is who named the religion as Islam and the name of Islam followers as Muslims. No Muslim can accept names introduced by mankind as Muhamadans or Muhammadians to replace names given by God to His religion and followers of His religion.
God is a title not a name. You can call Allah GOD but GOD isn't his name.
Islam is a religion per God revelation of Quran to prophet Muhammad (PBUH). Followers of Islam are called Muslims. No Muslim worship Islam or Muhammad.
Allah. Though Muslims believe to call Him with any beautiful name.
In Islam Muslims call their God by the name of "Allah". They also use "Khuda" which is Persian for "God".
The founder of Islam is Allah (God in English). Islam is God religion since start of creation of the universe. Islam is an Arabic word that means submission to God the Creator. It is the call of all God prophets. Refer to related question below.
Another answer from our community:The claim is simply justified by the fact that Islam (as an Arabic word) in its universal sense means submission to God. All God creatures were created on submission (Islam) to God. They have no choice rather than submission (Islam) to God. However, on mankind creation they were given the choice to do the good or the bad, to maintain full submission (Islam) to God as the one and only one God or not. Accordingly, over history, God assigned his prophets to call their people to Islam (submission to God) with no partner and no associate. Muslims believe Islam is the real mission of all God prophets; including Noah, Abraham, Moses, Jesus, and Muhammad (peace be upon them all) and all their followers are Muslims. However,Islam per Torah God revelation to prophet Moses (PBUH) was named Judaism,Islam per Bible God revelation to prophet Jesus (PBUH) was named Christianity, andIslam per Quran God revelation to prophet Muhammad (PBUH) was named the same name Islam.
The main message of Islam to all peoples is that: "there is only one god. He is the Creator, and therefore only he has the right to be worshipped."
This derogatory name for Muslims is derived from the fact that they are followers of the prophet Muhammad. However, Muslims believe this slang term to be disrespectful of God to whom they attribute having given them the name Muslims (followers of Islam).