Not even in the slightest. Where one man prays, there is a church. Where one man repents, there is forgiveness. Where one man believes in the death and resurrection of Jesus Christ, there is salvation.
Do Calvinists read the Scriptures, a book written by men?
Ah, there, my separated brother, is our great divide. You elevate the traditions of men over the word of God.
Am I? Wasn't the Bible written by human beings inspired by God? Thus, God deemed that He would reveal Himself through men. Thus, I am thinking that you ALSO access God through the words that Matthew, Mark, Luke, etc., used to express God's Word. Scripture was written by men. We, you and I, BOTH access God through Sacred Scriptures. Of course, the Word of God, in its totality, is NOT Scripture, but Jesus Christ, correct?
Regards