Those tithes will no longer be tax exempt. I had this discussion with our pastor a few weeks back. My ultimate conclusion: God doesn't like it when you render unto Caesar that which is God's, which is precisely what the churches have done in this case, and it was all so that the tithes would be tax deductible, thereby making tithing more attractive to church goers.
I never claim my tithe in taxes. What I give is between me and God and I do not do it for a tax break. The Bible says to give without expecting anything in return.
Then we’re gonna find out who is serious about rendering unto God what’s rightfully His.