In the world, how many God's are there?

none!

Throughout the history of man, thousands.

To many !!

0...but if you are asking how many deities have human's worshiped over the years, it is well into the thousands.

Logically the answer is evident...

5 Indeed, even though there may be so-called gods in heaven or on earth—as in fact there are many gods and many lords— 6 yet for us there is one God, the Father, from whom are all things and for whom we exist, and one Lord, Jesus Christ, through whom are all things and through whom we exist.

I am pretty sure it's anywhere from 3,000 to 5,000. I mean that is how many different people believe in, but I don't think any of them exist.

We Hindus alone are having 330 million Gods lol

At least as many as there are people on Earth.

I am the only true god.

I can give you everlasting peace for the low, low price of $37.63