Baptism rhymes with:
defeatism, irredentism, pietism, vigilantism, absenteeism, amateurism, anthropomorphism, antidisestablishmentarianism, atavism, buddhism, careerism, cubism, culturalism, defeatism, deism, dimorphism, dwarfism, ethnocentrism, extremism, idealism, irredentism, isomorphism, jainism, jingoism, marxism, masochism, mccarthyism, modalism, monism, monotheism, multiculturalism, multilateralism, nazism, nestorianism, parliamentarianism, pietism, polymorphism, polytheism, pugilism, realism, sadism, sexism, surrealism, taoism, theism, truism, vandalism, vegetarianism, vigilantism, voyeurism
Baptism sounds like:
bateson, batson, battison, beatson, beautician, biddison, boatswain, bodkin, bophuthatswana, botkin, botswana, buddhism, budson, budzyn, butson, butzen, butzin