The psalmist’s use of perfect man here and righteous man and upright in heart in v. 10 indicates that he considered himself perfect, righteous, and upright. See note Psa. 7:31.
This is how denominations are formed. The main direction is to come out of the system; it cannot change. "I began to realize that our practices have differed and deviated from our vision. Our vision was the same, our teaching was mostly the same, the truth is always the same, but our practice has really differed."