To be really honest with you, I don't think you have to have any religion at all to believe in God. Now, don't take me wrong, I am very religious, but I also believe that, for those who haven't studied religion, it's absolutely A-OK for you to believe in God as you want. You don't have to accept any Prophets or Commandments or anything.
However, if you mean in GOD, as in with-a-capital-G, the kinds that Jews, Muslims, and Christians believe in-- then still no. Because all three of those religions believe in Adam, Eve, Moses, Abraham, Jesus (not sure about Judaism, but I know Islam and Christianity believe in Jesus!).
Hope that helped, and good luck with whatever spirituality you accept!