Like water spilled on the ground, which cannot be recovered, so we must die. But God does not take away life; instead, he devises ways so that a banished person may not remain estranged from him. 2 Sam 14:14
AtG adds to your military strength. He does not make your units themselves +1. They are worth their normal values when sacrificed.
Just adding: This is true for all strength bonuses EXCEPT Genghis Khan. He improves the strength of each individual cavalry unit, which would be in effect when sacrificing.