Probably none since there has never been any evidence that any god exists. Even if one did exist then it certainly hasn't made itself known so there's no good reason to think that any god(s) have ever been real.
As a christian ... One .... Exodus 20..... 3 Thou shalt have no other gods before me. 4 Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth:
It depends on our religion, if suppose I am christian I will say that there is only one God ,if i am a Hindu I will say that there are thousands of Gods similarly if I am a Jain I will say that there are 24 tirthankaras...Its totally up to our religion.
Only ONE - it is stated at Psalms 83:18 and you can also read reference to his deserving praise at Revelation 4:11. Don't you think there would be so much confusion if there were many Gods. It would be like having 6 or 9 Presidents of a company - wouldn't work!!