Often I notice that both religious and non-religious people tend to talk about religion as something "man-made", thus allready making the assumption that their religion has no universal value. Isn't that fairly odd?
If there TRUELY is a god, then he/she probably is the god of the whole universe and not just the ones that happens to believe in him/her.
So if we were to discover an intelligent race beyond our own world, then I would be espescially intrested in getting to know what they allready know about God - NOT primarily TEACH them about a god. My god is reality, not a set of concepts made up by a single culture.
But of course I also would teach them about what I already found out about God.