Catholicism is SpongeBob holding a long paper, this is a reference to the fact that Catholic often have many rules.
Eastern Orthodoxy is a Soviet USSR SpongeBob because it’s the main denomination of Russia.
Methodism is SpongeBob with old fashioned hair, which is a reference to how John Wesley (the founder of Methodism) had grayish hair.
Baptism is Patrick holding an American flag because Baptists are a more Conservative denomination and patriotic of America.
Pentecostalism is the “we’re like brothers, only closer” with Jesus as Squidward because Pentecostalism often emphasizes a personal relationship with God.
Lutheranism is SpongeBob playing the piano which is a reference to Bach, who was a devout lutheran composer.
Anglicanism is a king Squidward because it was founded by King Henry VIII.
Presbyterianism is SpongeBob and Patrick looking at a computer with Redeemed Zoomer’s profile picture, which is a reference to the fact that Redeemed Zoomer is a Presbyterian.
Non-denominationalism is SpongeBob with a blank expression because Non-denominationals are not affiliated with any denominational church, and just kinda meh over all.