If FR is not your cup of tea, you can leave any time you wish.
It's your call, of course, but eventually you will have to deal with financial reality. Because those groups you've chosen as designated targets will cease to contribute to your fundraising appeals.
I'd hate to see that happen. I'd like to see FR return to the days of the March for Justice, when it presented a united front to the Clinton propaganda machine.
I support the stated goals of FR. I agree with you that Romney is not a suitable candidate for the Presidency. I would like to see Constitutional restoration gain credence as a political philosophy.
But I see no reason why any of that should entail Mormon-bashing or Catholic-bashing as a necessary consequence. And I'm surprised that you permit and (apparently) endorse both.