Although I tend to agree with you about only one planet being with life comporting with the Christian world-view, it is just my opinion. The Bible says God created man on this planet. It speaks not at all on what He may have done elsewhere.
.
>> “ It speaks not at all on what He may have done elsewhere.” <<
Not so!
The Bible makes it clear in numerous ways that the purpose of creation is Man.
Why else would he destroy the entire physical universe when the last are gathered from Earth?
.