He finds out that there is only one to turn to in the world and submits himself to that One.
God says in Verse 125 of Surah An-Nisa: “Whose religion is better than that in which one submits himself to God, behaves righteously, and follows the upright religion of Abraham, God's chosen friend?”
Who can better and more subtly and delicately introduce religiosity and religion to mankind than Abraham (AS)?
One reaches the truth of religiosity when he turns to God, just as Abraham (AS) said, “I have turned to the One who is the Creator of heavens and earth.”
And this turning to God is a great event in everyone’s life and with its blessings, he get free from confusion and distress.
He finds out that there is only one to turn to in the world and submits himself to that One.
When one turns away from selfishness and turns to God, it is the beginning of being Muslim. When he submits himself to the owner of all beauty, he will become righteous and do nothing by good. He will follow the religion of Abraham (AS), which is one whose follower even does not even desire doing bad.
It is the opposite of a path in which one desires both good and bad.
This verse (125 of Surah An-Nisa) brings together all good-doers of the world from every nation and religion. When all adopt Abrahamic behavior, God befriends them as he befriended Abraham and what happiness is greater than God’s friendship?