At no cost to the DoD: The answer is YES. Jesus died for the redemption of all of us created by God. I figure that God may not have begun or stopped with creating only us. Thus His Son is for all of us, where ever we are in His universe.
I think, if and when ETs are definitely proved to be real, most of Cristianity will adjust to it.
I think, if and when ETs are definitely proved to be real, most of Christianity will adjust to it.