How can America continually ask that God bless America, when America continually wants to push God out of America?
God bless America? How about, America bless God?
God will only tolerate America's sinful nature for a short time longer before he turns His back on us. When He does, woe to America as, literally, all hell will break loose.
"Righteousness exalteth a nation: but sin is a reproach to any people." - Proverbs 14:34 KJV
"If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land." - 2 Chronicles 7:14 (KJV)