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Just a short reply.
Please take a ;ook in Genesis and read about Noah. Also, early on we have an account of Adam and eve who knew God and taught their children about HIM and they also had [personal experience with HIM.
Noah was a Preacher. He preached Christ to all he could. They laughed at him and like most people today whom I have gone door to door in many subdivisions asking folks about their relationship or God, they chose NOT to lkisten and reject the messagenger and the message.
Nature itself shows the wondrous works of a divine creator and the Apostle Paul addresses that and unbelievers who can plainly see that that there must be a living GOD who created that.
Unfortunately the scientific community of unbelievers scoff at the the creation as accounted for in scripture because it does not fit their narrative of happenstance .
Anyway, without delving any farther and hopefully remember that GOD always had messengers who shared Faith in GOD and a COMING Savior as was told to Abraham and then later again to Moses. Moses had the advantage of God revealing himself and Abraham had two visitors from Heaven, one of whom many believe was an angel who was sent directly from God from His Throne to give him instruction and news.
So the scriptures are full of information in various places and times dating clear back to Adam and Eve, the very first people who had a direct relationship and their children, who passsed that on to their children, and so on and so on......
Consider LOT.. He was not a Jew yet he was a firm believer in the Lord God.. He had a great relationship with God and goiong thru trials his steadfast faith was accounted to him for righteousness.
Anyway, great question and I hope I may have shed a tiny amount of light for you.
Have a wonderful day!