More precisely, historically they overall believed that one is justified by faith alone - that being the instrumental means of procurement - but not by a faith that was alone. And this was and is evidenced in evangelicals manifesting more commitment and conservative moral views than RCs. http://www.peacebyjesus.com/RC-Stats_vs._Evang.html Glory to God for those who do.
Your view is the heretical Lordship salvation view and represents a departure from the Reformation view that salvation was simply by faith (trust) in the finished work of Christ which immediately resulted in becoming a new creature in Christ.
Works were never part of the salvation 'process', it was part of the growth process.