Folks can simply return to the original Church founded by Jesus Christ #1 Jesus didn't leave behind a denomination.Denominations are led by people. Fallible people. He promised to send a "helper", aka Holy Spirit.
#2 There's nothing "original" about the RCC or the Orthodox. They both worship on Sunday. If you want original, worship as Jesus did, on the Sabbath aka Saturday.
Protestants divide into tens of thousands of denominations all claiming to “just believing the Bible”
#1 We are to believe in the Bible. It's from God and His Word is sure.
The Apostles had minor disagreements amongst themselves. They settled them and went on.