A hypothetic civilization, mastering the "holy grail" of space engineering - interstellar travel - must be quite advanced, so much more advanced in comparison to our current state, that we would appear like a Neandertal...

Such developements of civilizations proceed over an extremely long timespan, and I am deeply convinced - proven by history until the current day - that a civilization whos ethics and goals are predicated on religious ideas cannot last such long, with the advancing of technology they will either extinct themselves or drop such irrational ideas from the bronze age.

*With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion.

Steven Weinberg - Nobel laureate 1979*

Oh and please never mix up science and religion, individual scientists might glue to some theories as if they were dogmas, maybe because they spent their whole life proving them, but a true scientist and science collectively MUST and WILL abandon a beloved theory if there is a conclusive counter evidence...  Relgion won't and can't do that for they are self-contained and their architecture disallows any prove or disprove.