Maxwell Lord was a crafty businessman and manipulator who organized various incarnations of the Justice League of America, including the Justice League, Justice League International, Justice League Task Force and Super Buddies. Maxwell Lord also became the leader of the international peace-keeping force Checkmate.
Maxwell Lord came to believe that super-heroes and metahumans generally posed a grave threat to the well-being of humanity generally. He saw himself as a champion of normal humans. To these ends, he plotted to destroy the reputations of superheroes, including Superman, Wonder Woman, and others.
We do not know what Maxwell Lord's religious affiliation is. He was never portrayed as religious at all, and did not seem to have any particular allegience to any religion or philosophical system outside of his own ideas, which he thought very highly of.
Maxwell Lord was clearly a narcissist. He deeply resented superheroes and super-humans for "elevating themselves" above common people, yet Maxwell Lord took it upon himself to act as judge, jury and executioner of the superhuman community, even while living and working among them.
Below: Maxwell Lord apologizes, shocking Booster Gold, who says that is against Maxwell Lord's religion.
[Source: Formerly Known as the Justice League #1, published by DC Comics (2003), pages 16-17; reprinted in Formerly Known as the Justice League trade paperback (2004), pages 20-21; written by Keith Giffen & J.M. DeMatteis, pencilled by Ken Maguire, inked by Joe Rubinstein.]