Then it is false to it core beliefs, which then in turn makes it false Christianity.
After this biblical event warfare and even capital punishment were to cease, if people are using Theism to kill they are in direct violation of the
bibles commands.
Matthew 26: 52 & 53
Then Jesus said to him, "Put your sword back into its place; for all those who take up the sword shall perish by the sword. 53 “Or do you think
that I cannot appeal to My Father, and He will at once put at My disposal more than twelve legions of angels?
This shows that the time for man to fight for God's sovereignty on this earth with any weapon that causes death was over. Any christian that used
swords and later guns was in direct violation of scripture and would never have God's blessing.
In fact those that kill there brother are condemned as the devils children, since our brothers encompass all mankind we can't be killing anybody or
forcing Christianity, or a certain way of life on anybody, right now only God himself has that right, if Jesus didn't do it, should his true
followers?
1 John 3: 10-12
This is how God's children and the devil's children are distinguished. No person who fails to practice righteousness and to love his brother is
from God. 11 This is the message that you have heard from the beginning: We should love one another. 12Do not be like Cain, who was from the evil
one and murdered his brother. And why did he murder him? Because what he was doing was evil and his brother's actions were righteous.
Theism would never have killed a soul if it had been practiced they way Jesus intended, instead some very evil men abused it, and yes they did kill
billions, either directly or indirectly. And God hates it.
This is all part of the great Apostasy that scripture predicted.