Clerics and mages of the church specialize in holy magic. Holy Magic was referred to as the work of the Angels as it was used to heal wounds, illness, burn and punish demonic and undead. If you asked about celestial magic then it would just confuse them. Holy magic is what would give an angel transformation as it is mastered.

As for enhancing people, I'm not very educated at on celestial since celestial usually has something to do with the stars, but enhancing in the middle of a fight would be the work of a templur. They use shouts, roars, and even songs to boost the morale and overall effectiveness of their allies. Their shouts also boosted people physically and such for a short time. However, templur did not condone the usage of most other magics.