Well, your neighbor from Calvary Chapel does not speak for all Protestants. And anyway, I doubt your neighbor from Calvary Chapel believes that Sunday School or “non sola scriptora prayer” (whatever that is???) is forbidden by Scripture to begin with. Therefore, I highly doubt you understand what he means by Sola Scriptura in all honesty.
This is what the Evangelical Covenant Church believes:
“the holy scripture, the old and the new testament, is the Word of God and the only perfect rule for faith, doctrine, and conduct.”
Calvary Chapel believes:
We believe that the scriptures of the Old and New Testaments are the Word of God, fully inspired without error and the infallible rule of faith and practice. The Word of God is the foundation upon which this church operates and is the basis for which this church is governed. We believe that the Word of God supersedes any earthly law that is contrary to the Holy Scriptures. It is from God’s Word that we establish our doctrine and Statement of Faith. (Isaiah 28:13; Nehemiah 8:8; John 17:17; 2 Timothy 3:16-17; Hebrews 4:12; 1 Peter 1:23-25; 2 Peter 1:3-4 and 1:21).
You see! The statement clearly says that CC believes that it “establish[es]” its doctrine and beliefs on God’s Word. It derives what it believes from Scripture. In other words, it judges and measures everything it believes against the Bible.
It’s not about finding it in the Bible. It is about being on a solid foundation. It is about not being carried away by every man made tradition that claims to be sacred. It is about not being carried away with every wind of doctrine. It is about not binding what God has not bound and not loosing what God has not loosed. It is about believing that all things necessary to salvation is told and given to us in Holy Scripture so that we might not be led astray or without guidance. It is about not letting guesswork or circumstantial doctrines be declared de fide.