“How do I know that God will not forsake me if I come to Him?” Just look to Jesus. Know that He was forsaken on your behalf, so that you would be accepted by God. Trust in His death, and trust in His resurrection. Return to Him with repentance and faith and receive the gift of adoption.
I was reading about the prodigal son recently, and I was freshly reminded of the wonderful grace of God. If you’re unfamiliar with the story, this son forsakes his family, runs off with his inheritance, and wastes all of his property on loose living. A famine hits the country, and because of his bad decisions, he essentially sells himself to a foreigner and becomes a pig farmer. While in this bleak situation, it says that he “came to himself”. He remembers his father. He remembers the goodness of his father. But he also knows himself. Surely he could not go back as a son. He realizes that it is better to be a slave in his father’s house than to be free in the world. So the Prodigal Son decides to go home and enslave himself to his father.
But the father surprises everyone. Upon the son’s return, the father runs to meet him! He clothes him, feeds him, and celebrates him. Not only was he not rejected by his father, but he was reinstated as a son. The father rejoices that, “this my son was dead, and is alive again; he was lost, and is found.” Incredible mercy that this father shows to his son!