We have a church tax in Germany. Both income tax and church tax are deducted from the income and paid by the employer. This tax system earns the two largest (Catholic and Protestant) churches almost eight billion Euro per year (about 4 billion each).
The only way to avoid this is to resign one's church membership. But then you aren't eligible for the services of some church-run institutions such as Catholic kindergardens, despite the fact that they are sponsored by the state. Many German Catholics and Protestants never visit a church and are likely agnostic. They simply remain members because they might want a church wedding or a religious burial some day.
The New Apostolic church that I grew up in opted out of this system, because they make a lot more money by asking their members to tithe. 10% of the entire income beats 9% of the income tax, which is the current church tax rate. And since all preachers, deacons, and even the cleaning staff work on a voluntary basis, most of the money ends up in the pockets of the top "apostles", which are the only ones who get paid. If you want to get rich quick, found a new religion
