As per Islam we believe that only one God who is the creator, Protector and the destroyer. 
He neither begets nor is born, Nor is there to Him any equivalent. He created the world and all
living things especially the humanbeings only for worship Him.

Now imagine that there are many gods on this earth.. There will be problems and problems like the politicians we see in the country now.

Now when one god says rain, the other god says sun is enough.

Now if one god kills someone, the other god will make him alive.

One god made a man rich and another god made him a beggar.

Like this, there will be wars between the gods.. When the people cannot live with the problems and troubles created by the politicians in the country.. What will be the situation if the gods fights among them.

Then this earth would not have existed even for a day.. Gods would have perished.. and the belief that the one who does good is heaven and the one who does evil is hell will also disappear. Which god will put whom in heaven Who will go to hell?

That is why God tells man to think.

According to the Holy Qur'an, He created all the things necessary for man on earth and then finally created man and then told about all the things on earth.

Even before the creation of humans, there were jinn and angels. After the creation of man, when he was commanded to prostrate himself, all the angels did except the devil. God cursed the defiant devil because of his pride. And it must be permitted that the accursed devil will put these men who have defied God into the ways. God gave permission and said that you cannot do anything to him who lives according to me.

Satan led God's first creation, Adam and Eve, astray from God's path. They later repented to God and returned to God's way. After that, he keeps trying to mislead all the people who came.

Satan's only trick is to mislead men from monotheism. So the things that God created on earth were shown to be God. Sun, moon, cows, snakes etc. were believed to be gods.

Almighty God sent prophets and scriptures from time to time and showed people the right path so that they do not fall into these schemes of the devil. Those who were on the right path and did not fall into the wiles of the devil were victorious.

This devil did not spare the prophets either. They were also shown as gods and misguided. So let us humans think and understand. Read and understand the scriptures and be on the right path may God bless us.