What is the need of God?
Hindu scriptures explain it ---
Any action has a motive.
There are five motives - To gain or retain :
1. Happiness
2. Life
3. Knowledge
4. Freedom
5. Power
Happiness is supreme.
All others are acceptable as long as they bring happiness.
The happiness when sought, it recedes. Again other action, again happiness is sought, again it is lost. Cycle continues.
Why anyone should seek happiness?
Hindu gives answer, 'God is happiness infinite. Soul which is originated from God but away from God tries to reunite with God. Thus everyone is after happiness.'

Unless and until infinite happiness is sought, search will not end. Hence GOD is very much needed. Without God no one can be complete. Thus all of us should worship God.
Islam does not provide any logical base for worship of God, Hindu does.