It’s a little hard to reconcile a universe with galaxies so far away that light from them has taken 14 billion years to reach us with a universe that was created in 7 days about 6 thousand years ago. If someone considers only those who believe in a literal interpretation of Genesis to be true Christians then it is easy to understand how that person could say that any potential alien must be a misidentified biblical creature instead.
I have Christian friends when explain all this by proposing that God could have created an ‘in progress’ universe 6 thousand years ago. After all, an all powerful and all knowing God could do anything, and who are we to question His motivations. But I’ve never felt that such an explanation satisfies even those making it.
God’s days are different. The first day that was declared the stars were’nt even created. It was men who said that the days were measured by the light of our star
Could be FAR more than 6,000 years.