Tax the shit out of them ...

That's what the Italians are doing:

After several years of scandal in which the Catholic Church has faced allegations of financial impropriety, paedophile priests and rumours of plots to kill the Pope, the Vatican is now facing a new €600m-a-year tax bill as Rome seeks to head off European Commission censure over controversial property tax breaks enjoyed by the Church.

...

And that's what we should be doing here. The megachurches, all of the Catholic Church's property, the synagogues, and every other house of worship. If the preachers play in politics, they should be taxed at double the rate.

Great thanks to Chris in Paris for the link.