So how many Heavens are there since muslims , christians, jews, etc profess that they will go to heaven?

There are different gates - but they all end up at the same place, kind of like a large theme park with different "countries" inside it. So you might enter "Charismatic Evangelist" heaven, but if you walk to the end of it - you are right in Valhalla. And if you turn left from "Lutheran" you will end up in "Methodist" sooner or later. I could make a creative word puzzle from this or draw a map, but you get the idea. On the other hand, the rest of us will be hanging out on the beach to the left of the theme park.