The only source for gun control is a virtuous people, ground in faith to God.
Violence comes from the selfish, the Godless, the ungrounded.
We could start by unshackling the “free exercise” clause of the Constitution.
Few religions would praise a man for spending his last ten minutes of life killing or wounding 500 people. How sad that I must say "few" rather than none.
There's little doubt in my mind that the shooter did not believe in an eternal afterlife tailored to reward his behavior on earth.
I haven't read through the Ten Commandments recently but I believe that at worst they would be a nuisance and would definitely condemn the shooter's behavior.