We know the universe began to exist because all the scientific evidence, like the Big Bang and the second law of thermodynamics, points to a beginning, and philosophy shows you cannot have an actual infinite past.

God exists in the sense of being the necessary, immaterial, timeless cause of the universe. He is not made of matter or bound by space and time. As for evidence of an eternal consciousness, the fine-tuning of the universe, the origin of information in DNA, and the existence of objective moral values all point to an intelligent, personal source rather than blind, unconscious forces