You wrote:
“I still haven’t received an answer on the selling of induldgences;”
The Catholic Church never sold indulgences. So why would you expect the Church or her members to provide a verse for you in support of something the Church never did?
“the praying to dead people;”
The saints - according to Christ - are alive. Also, Not all truths are in scripture so why would you expect all truths to have a verse?
“and the celibate priesthood.”
Christ Himself was celibate among human beings. He also praised celibacy in the gospel of Matthew.
First, I need to explain that I was born in Europe, brought up Catholic, attended Catholic school through 12th grade, so I am not talking about hearsay but real life experiences. I was 8 or 9 when my grandmother went on a pilgrimage to Rome. She visited the Vatican, saw Pope John XXIII in a general audience, and returned home with a certificate that she had purchased right there, at the Vatican. It stated that my father, and all of his family, did not have to spend time in purgatory for any sins commited up to the date the certificate had been issued. What do you call that? I know I was young, but I'll never forget my mom trying to find out how much had grandma paid for it. It certainly wasn't free! It's been almost 14 years since I last visited Spain, but last time I was there, the framed certificate was still hunging there, in an honored place in the living room.