To tell you the truth, i don't care what phrases other countries or mine are using to boost their faith or whatever. Also i don't believe that to be with god, you have to go to the church. God lives everywhere and not just in a place and he doesn't take the side of any nation, he is just watching over us.
About the phrase god bless America, i think that you feel that it is ironic, because the last years, they tend to use it in almost every movie that comes out, i don't think that if you go to America, you will hear the people there saying that phrase all the time.