We are called to belong to Jesus Messiah by faith and obedience.  Faith without obedience is wishful thinking.  Obedience without faith is presumption.  This calling is open to all people.  It is a call to be saints.  Saints are not marked by faith OR obedience but faith AND obedience.  These two must never be divided.

“Jesus Christ our Lord, through whom we have received grace and apostleship to bring about the obedience of faith among all the Gentiles for His name’s sake, among whom you also are the called of Jesus Christ…called as saints”. Rom 1:4c, 7a (NASB)