Interestingly, the church tax has made the German church richer than any other church, but it also made them deviate from the teachings of the Church. Most British clergy I know of are shaking their heads over the situation in Germany, where the German church appears to be after mammon rather than teachings of God. In order to get more tax money, the German church is very secular and is very liberal in order to appeal to the increasingly secularised society, so they can keep that lucrative source of revenue. And the German bishops are the main pusher behind towards liberal ideologies such as homosexuality, divorce, abortion, ordaining women priests, etc.
I personally find it interesting that when the government gets involved with the churches, they become increasingly liberal and they adopt the way of the world, like what’s happening with the Anglicans, especially the C of E. This secularisation actually prompted some high church traditionalists within the C of E to cross the Tiber and join the RC Church, including some prominent people like Her Majesty’s former chaplain Gavin Ashenden, HRH Duchess of Kent, and Lord Nicholas Windsor.