How do religions explain all the zillions of planets?

Dades wrote: »

Well obviously when most religions were being put together they simply had no idea even one other planet existed.

They're not mentioned for the same reasons dinosaurs aren't.

Venus and (probably) Saturn are mentioned in the Hebrew Scriptures. There is also occasional (hostile) mention of various gods worshipped by the Babylonians who were associated in the Babylonian cosmology with Jupiter, Mars and Mercury, though whether the Israelites knew or cared about that association is less certain.

But, yes, they probably knew about the planets. Their calendar was a lunar calendar, and the progress of the year was measured, amongh other things, by observing where the moon rose and set, relative to the positions of the stars. This requires you to observe the stars, and you can't observe the stars for too long before you notice that, while they are mostly fixed relative to one another, a few of them wander around. They are the planets. There are seven of them visible to the naked eye, the Hebrew scriptures name at least two of them, all seven were known to neighbouring cultures and we have no reason to think that the Israelites failed to notice them.

ScumLord wrote: »

There must have been kangaroos on the arc or they wouldn't be around today. Maybe they just had a different name back then like with dragons, they could have been called demons or Edomites.

you're missing the really clever (dare I say devine) bit.

there WERE kangaroo's on the ark, then when the waters receded, god gave them all fossils to put in their pouches and told them to scatter them around the in just the right places on their way back to Australia.