If you plan to carry at church, for your fellow parishioners’ sake please get training.
What’s needed is a security “team: in the parking lot, a team to guard the doors. Others should take strategic positions so they can effectively engage any threats that make it past the first lines of defense.
What isn’t needed is some untrained idiot sitting in the midst of the congregation drawing his weapon and “start returning fire” thinking he’s going to effective. I don’t want to be anywhere near such dangerously stupid people.
It’s better for an effective few to be armed.
I would take it a step farther...If you plan to carry please get training. Utah issues a CCW permit recognized in like 26 states for taking a 4 hour lecture class without even dry holster practice, much less firing a shot. I have one but I have enough sense to be professionally trained in defensive shooting from a holster and to practice regularly. Even the states that require shooting only require a bare minimum. You can be legal with CCW without being competent or qualified to use a gun, kind of scary.
A less than optimum situation may still be quite superior to other outcomes.
If one outcome is that an unoppposed attacker kills 26 and another outcome is that a poorly trained citizen kills the attacker and 1 innocent bystander, I'll take the latter.