[krapp]

>otherwise Christ as God/Human is totally senseless and useless on these other planets...which can not be since God does not change

This doesn't even make sense. God being unchanging doesn't imply that the relationship of all created beings to God must be the same. Genesis makes it clear that humanity was created in a state of perfection and then fell from grace - and yet God didn't change, despite humanity's relationship to God changing. Therefore it is possible within Biblical canon for created beings to exist which do not need salvation through grace - humans are an exception, not the rule.

I mean, within the Bible, there are humans who just don't die and go straight to Heaven because God likes them and decides to waive the immutable stain of original sin like a parking ticket, because apparently even God's rules can have exceptions.

Also, your assumption that the only creation God engaged with was planet Earth is fallacious. Genesis clearly states that God created the Heavens and the Earth. He created the entire universe. The Bible doesn't mention the dinosaurs either (no, Leviathan doesn't count, file that under the common Indo-European motif of chaoskampf) but we know they existed.

I'm not even religious but I can see your point of view is a bit too limited even within Christendom. CS Lewis was writing about aliens within the framework of Christianity a century ago. Many religious people can square that circle quite easily, simply by assuming God is not strictly limited to what is contained within Biblical canon.