You can do the paper work yourself, if you want to. I chose to pay someone else to do it for me, so I have more time to troll on Slashdot.

The EUR 13 includes sales tax (25%, EUR 3.25) and postage times two (to you and to the church, total about EUR 2) and then he has to pay income tax of the remaining EUR 7.75 (around 40%, EUR 3.10), leaving him with something like EUR 4.65.

The Danish website https://www.ingenkirkeskat.dk/ (no church tax dot dk) has been up for a few years. I used it to resign from the church, and got the additional bonus of saving 0,80% income tax. The site says he (it's a one man operation) has saved Danish tax payers DKK 123'535'000 (EUR 16'500'000) so far. His fee is DKK 99 (EUR 13), because in Denmark it has to be done in hardcopy.

Having a hash of your mission statement in your logo is an awesome way of saying; We have integrity, our mission can not secretly be altered.