We can see it all over from the moon/star

It was never an Islamic symbol during the early muslim expansion. It became one with the establishment of empires especially the ottoman one.

You people treat Muhammed as if he were a God or something

You aren't knowledgeable enough on Islam. It considers idol worship as the greatest possible sin and it even openly adopts iconoclasm (forbidding images). Muhammad's image is never drawn to not make him an object of worship.

How are you any different from Christians?

The concept of Trinity doesn't exist for muslims. Jesus is a prophet (one of the most important ones) but not God. Muslims and Christians agree on the following: Jesus was born by virginal birth, he is the Messiah son of Mary, and he will come back at the end of times.