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This sounds like something you're added onto the gospel, because those in Acts were told to believe that Jesus was lord and son of GOD who was raised from the dead. That faith justified them. So it seems that you have added something more, i.e., that a faith that eschews works is required to maintain that justification.
To many will say." It is faith alone and nothing else! But that faith WILL work, if not then you probably are not saved."
And the bible says," It is faith alone in Christ alone and nothing else! And that faith may or may not have works. Because it is up to the believer to be positive or negative to Gods word after salvation, but either way the believer is saved eternally."
Eph 2:10~~King James Bible
For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should (maybe we will, maybe we won't)walk in them.