You Bible only folks do NOT go by the Bible alone... To list all the examples of how you defy your own doctrines, I'd have to be here all day..
But here's one example: Luther taught that you could commit adultery 20 times a day and still get into Heaven... the old OnceSavedAlwaysSaved thing... But that is nowhere in Scripture and you can't find anything tht remotely says anything like it. Protestants go by that OnceSaved thing (yes, I know.. not all of them).. In any case, Jesus said Go and sin no more. End of Sentence.
So don't go all sanctimonious on us with that BS (how ironic...) about going by the Bible... while us schmucky Catholics are just always, always ignoring Scripture, as the endless accusation goes...
And you need to answer this Q: Who is going to baptize people if all you need is Jesus? The little people are going to baptize each other? Who is going to marry people except a minister... Jesus chose HUMANS to do His work on Earth... humans like the first pope, Peter and the other 11 and all their successors, the popes who came after Peter and their clergy. Or maybe Jesus can just pour the baptismal waters over people by Himself... straight from Heaven... no humans involved? We'd all love to see that, wouldn't we?