https://en.wikipedia.org/wiki/Church_tax#Germany
" The church tax is only paid by members of the respective church. People who are not members of a church tax-collecting denomination do not have to pay it. Members of a religious community under public law may formally declare their wish to leave the community to state (not religious) authorities. The obligation to pay church taxes ends once such a declaration has been made. Some communities refuse to administer marriages and burials of (former) members who had declared to leave it. "
In many European countries, everyone (community member or not, believer or firm atheist) has to pay full taxes to pay for the churches/synagogues and mosques. Including the salary of priests. This in addition of them also not being taxed due to their special status.
Despite not living in a theocracy, many are forced to participate directly in a cult that might be of zero interest to them.