Mixing works with grace is what God says to do.
He gives the grace for us to do the good works.
That is not a counterfeit gospel.
And how do YOU know who is saved and who is not?
Did God go on vacation and leave YOU in charge??
Only God knows who is saved.
Galatians 6:7-10
7Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap.
8For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.
9Let us not lose heart in doing good, for in due time we will reap if we do not grow weary.
10So then, while we have opportunity, let us do good to all people, and especially to those who are of the household of the faith.
We are not to be deceived...we are to do good
and IN TIME we will reap what we sow IF we do not grow weary.
Those that believe they are somehow "sealed" in the Holy Spirit are sadly mistaken since this expression is not even understood in our day.
AND, we are only sealed for as long as we WANT TO BE.