How do I get the Theology tech?

The easiest approach is to simply not trying to stockpile furs.

Hunt, then turn the furs into parchment and wait for catpower to recover. Repeat until you have the required amount of parchment.

An easy way to get a positive amount of furs is to build a tradepost. This will decrease the demand by 4%. This doesn't stack, but is 4% over the new number every time:

• level 1 tradepost: demand 100 - 4% = 96 demand

• level 2 tradepost: demand 96 - 4% = 92.16 demand

Add to this the option to send out hunters - more means faster hunting. You will eventually gather faster then you are consuming it.

If you want to gather even more furs and other luxurious items I suggest creating the mint building. In exchange for catpower and gold it will create furs and ivory.