“What religion were the Apostles and their descendants following before the Church collected the 72 books of the Bible 300 years after the death of Jesus?”
The Apostles followed no religion. They followed Messiah.
“The Holy Sacrifice of the Mass developed organically...”
Meaning “apart from the Apostle’s teaching and the Words of God.”
No one cares what Protestants think about the Mass.
Jesus founded a religion. He told the apostles to teach the truths he had taught them, and to teach people to obey his commands.
That’s a “religion.”