Shojo manga loves to play with Christian imagery, but that doesn't always means it's tasteful about it.
CROSS (Juuji Kurosu), by Sunuko Amakawa. First published in 1997 and first published in North America in 2004.
PLOT:
Tamara Amakusa is a holy exorcist working for the Catholic Church. Wherever demonic forces are at work, he is there to fight back in the name of the Lord. He faces his strangest battle yet when a strange girl stumbles into his church with mysterious powers and connections to a Satanic cult.