Salvation by grace is different from other standards of rightstanding with God across the ages. It’s unmerited.
Adam at creation was implanted with a Hypostatic Chip, which is a miniaturized image of God. The likeness of God in man is volition. By choice Adam sinned and lost the implanted image of God.
Since the Day of Pentecost every saved person has an implanted image of God. Can sin make a person saved by grace to lose his or her salvation?