Bazigaar:

if iman is a contract that means God is up there doing a business interesting...

now question is..if we believe God is all powerful, then why does he offers us these contracts? (iman/religion)? why not just force them on is...?    why go through all this contract thingie

You bet, its a trade, commerce, business.... however you comprehand it. That's how humans understand the value of a covenant.

Allah says in Surat tauba, "....should I tell you about a trade-off which will prevent you from the torment of fire."

In surat Al-Asr He says, "By the time, entire mankind is in loss, except for those who believed ..."

In Surat Al-Baqarah, Allah says, "...and they traded misguidance in return for guidance and the life of the world for Akhirah."