Multiple gods can also explain, but, i think the human mind in centuries has not accepted idea of multiple gods.
As for happening without cause or creator, at present no scientific evidence exists that from the nature of universe that it could happen without cause or creator.
I don't know why are you focusing "Allah in Islam" thing, are you satisfied with concept of God in other religions and have problem with Islam's Allah only?
Allah and all the other Gods are the same.....and I don't believe in any.