Here is the current citizenship oath I just found on Wikipedia:
I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God.
Apparently you are allowed to drop the “so help me God” and you can say “affirm” in place of “oath.” The “anarchist” and polygamist language should have been left in for the communists now among us and the muslims who want shariah, which includes multiple wives.
I’m assuming the oath that you don’t believe in polygamy was a means of weeding out muslims. It was unlikey that many Mormons were coming from Europe and that leaves Muslims.