Once you're dead, that's it. Journey over.
I find the idea of an interdimensional soul spirit much harder to believe than aliens.
I guess it depends on what you believe about that god.
The old testament god of the Bible had no problem destroying its creation and starting over. Following that logic, I think it would easily create something else somewhere else.
So, if that specific god exists, I think that makes it more probable that an intelligent creation exists elsewhere in the universe.