Why does God have to step in every half hour and make a decision about what is affected by the UA?
From Tom's statement:
UA only affects certain bodies with special properties, which is why it does not affect us.
This is a highly ambigious statement, which given the vagarities inherent in "certain bodies" and "special properties" and "not affect us" calls for the Hand Of God.
Unless you can specify rules which are applicable to all bodies at all times then this is an appeal to divine intervention.
I disagree. Just because such rules are unknown doesn't mean they don't exist. I'm of the opinion that the heavenly bodies are composed of something entirely alien to us and that's the reason why they are able to float above us and still be accelerated by the DEF. Meteors, demonstrably, are not, so they fall to the earth when caught in the DEF. It's pretty simple; no divine intervention necessary.
Even given Tom's statement: you're right, it's vague, but that could just be because we don't have enough knowledge to know what the rules are. There was a time when the same could be said of magnetism, and many probably assumed there was some kind of supernatural power affecting the magnet. With further research, we could move on from vague explanations involving witchcraft and explain it scientifically. Just because we're not there yet with FET doesn't mean that we won't be in the future. Again, no divine intervention necessary, just the humble admission (so elusive to those who study science from a RE perspective) that we don't understand all the mysteries of the universe and still have much to learn.