European countries that have mandatory church taxes are about as religious as their neighbors that don’t
In general, Western European countries that have a mandatory church tax aren’t any less religious than those that don’t have such a tax.
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Giving a share of one’s income to the church has been a part of European tradition for centuries. Today, several countries continue to collect a “church tax” on behalf of officially recognized religious organizations, in some cases levying the tax on all registered members.