A church does not need to take any action if it wishes to allow handgun license holders to conceal carry or open carry in church buildings.
The law is convoluted but the plain text of it states that it is illegal but not applicable unless there is a 30.06 or 30.07 sign posted as applicable.
So as a prudent gun owner, do you take the risk of committing a gun crime because you failed to notice the sign? Or do you just not bother?
I stand by my original statement: Texas gun laws SUCK on ice!