What impact would the discovery of extraterrestrials have on religion?

Assuming that they are only a few light years away, would Evangelicals attempt to convert them? Might the ET’s have trouble accepting that God’s only child was born on Earth and took human form? If any did convert, how could they face Jerusalem?

What if they had their own version of Christianity. Would Jesus and his counterpart be half brothers, and would they coordinate their activity so that the dead are raised on Earth at the same time that the dead were raised on the other planet?

What questions do you have, and why has nobody else carefully considered this?