According to concealedcarry.com, concealed carry is banned in only two states, Nebraska and Louisiana. It requires permission from a church leader in seven states, Arkansas, Georgia, Michigan, Missouri, North Dakota, Ohio, and South Carolina. In the other 41 states, you have the right to conceal carry in church just as you do in other private property.
The church may ban the practice, just as you may in your own home. But there is no law to prevent you from exercising the Second Amendment in church.
Dean Weingarten