Well obviously if a planet once had a magnetic field and now does not, the only possible explanation is that God created the universe.
It doesn’t matter what the question is, for some people the only possible explanation is that God created the universe (or at least everything living thing on Earth) within the last 10,000 or years. Any evidence to the contrary must be wrong, because it disagrees with their literal reading of the Bible. I think such people are loons, albeit largely harmless ones (as long as they’re not allowed to spread their anti-science dreck in science classes as “creation science” - an oxymoron if I ever heard one).