My dad is a Baptist minister. He doesn't believe in carry in churches because Christians should be willing to turn the other cheek even to the point of dying, in order to be a living witness of the love of Christ embodied and personified by his followers. A church shooter who saw the devout believers meekly accepting their fate confident in their eternal reward may be just what a criminal needs to lead him to the path of repentance and salvation, and good Christians should be willing to make that sacrifice to save a soul.
I don't interpret the bible in quite the same way. I won't say that I carry in church, but he doesn't hug me quite the same when I go to see him preach anymore. I don't think he wants to know if I am or not.
I'm Bapticostal, I don't think I love anyone enough to let them shoot the people around me or me for that matter. Sacrificial Lamb job has been taken and completed.