Muslims believe in one God (Allah SWT).
They believe that Allah created the universe, the world and everything in it. Muslims only worship Allah. Muslims believe it is their duty to worship Allah because of everything he has provided.
The fundamental belief of a muslim:
I Believe in Allah,
and in Allah’s angels,
and in the Holy Books,
and in Allah’s Messengers,
and in the Day of Resurrection,
and in destiny,
That all good and bad come from Allah,
and that there is life after this life.