The idea that the Big Bang has a beginning is universally accepted. But what happened before that?
Could the universe have come from a previous iteration of the universe? It is possible scientifically and even scripturally. The Bible states that God will create a new heavens and a new earth. Who knows, God may have been doing this for all eternity. When you consider that God is an infinite being, then the existence of a universe could well be much further back than just our current universe.
Isaiah 65:17
“See, I will create new heavens and a new earth. The former things will not be remembered, nor will they come to mind.”
Revelation 21:1-3a
Then I saw “a new heaven and a new earth,” for the first heaven and the first earth had passed away, and there was no longer any sea. I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband. And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them”.