Note: There are Anti-Clerics (listed below) who have similar powers to Clerics.Those Clerical spells underlined on the table for Cleric Spells have a reverse effect, all others functioning as noted.
What is listed below are the level titles for the Anti-Cleric. Compare them to the regular Cleric level titles:
Evil High Priest.
Note that the only level title that does not get the designation "evil" is the Shaman — an explicitly pagan title. It seems to me that (beyond the already largely Christian level titles and spells) that this is the strongest evidence I have found to suggest that the original conception of the Cleric class was of a pseudo-Christian.