There's nothing anti-American about preaching politics from the pulpit. The only things wrong here are (1) different treatment of the churches because of their differing political persuasions -- if anything smacks of establishment of government religion, that does! -- and (2) churches who think it's always better to be politically silent than to pay taxes. Owing to their lack of faith, they effectively silence themselves.
"different treatment of the churches because of their differing political persuasions -- if anything smacks of establishment of government religion, that does! "
Exactly. Which is why all action of this sort should be avoided, for this very principle. This church should be as 'hammered' with negative publicity, fines, whatever as any 'GOP'-supporting church would be.