The problem for the RC is not understanding what Christ has done for us.
He has cleasend us from all unrighteousness. All of it.
If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness. 1 John 1:9 NASB
The Greek word for all conveys the following meaning:
3956 /pás ("each, every") means "all" in the sense of "each (every) part that applies." The emphasis of the total picture then is on "one piece at a time." 365 (ananeóō) then focuses on the part(s) making up the whole viewing the whole in terms of the individual parts. https://biblehub.com/greek/3956.htm
The command, “Be ye Holy” is not humanly possible. Therefore when someone is born again, GOD cleanses the spirit and soul and IMPUTES the righteousness of Christ (The Holy One of Israel) to the new born. In that way is fulfilled the command “Be ye Holy”.