Does religion make armies stronger?

[rado84]

This is precisely why it gets stronger - They don't think and just obey, live slaves.

This is precisely why it gets weaker! History has proved wars are being won not by religious bigotry but by capable of thinking generals and tactics. Bigot army will simply throw itself on the line of fire because "god" will protect them and they'll die while the enemy army will survive to win the war.
It's absolutely the same as the matches in "World of Tanks" - the noobs throw themselves somewhere in the open without any team-mates to protect them (because of the stupid belief they'll survive on their own) and naturally they're being destroyed by the enemies who know how to ambush.
I can't explain it any better but I hope you understood it.

The only thing that religion does to the soldiers is making them merciless killers. Nothing else.