Depends on the nature of the purported sin. Eating pork or not circumcising boys were sins till the Church abolished these restrictions (Acts 15).
Ceremonial and disciplinary law is the prerogative of the Church. Laws of faith, nature and ethics are different, -- the Church may clarify them but she will not fundamentally change them.
“Depends on the nature of the purported sin. Eating pork or not circumcising boys were sins till the Church abolished these restrictions (Acts 15)”
Uhhh... No. The decision was made by God and He so informed the church of His decision. The Law had been fulfilled in Christ and thus was no longer binding upon anyone.