I think we really should be looking at the tax-exempt status of religious organizations have that subsidiaries that are doing their taxes and setting up shell companies to hide where money is coming/going.
Simpler : if churches get tax-exempt status, then they are bound to the state in receiving that status, and violate separation of church and state? I haven't been able to find where tax exempt status for churches is established, and I've looked, but not my area of expertise at all. What if the goverment were to just stop giving churches tax exempt status? (edit: clearer)
I personally think the incestuous menage-a-trois between corporate interests, the Republican party and Conservative Christianity is a bigger threat to liberty, but whatever.