I'm around. I'll be in every drop of falling rain, every speck of dust that the wind blows, and in the sand, in the rocks, and the sea. (...) And those answers will be in each of them. Maybe not today but... someday. People don't need to pray to me or to sacrifice to me. They just need to know that I'm already a part of them and to trust in that. I won't be hands on. Chuck put himself in the story. That was his mistake. But I learned from you and my mother and Castiel that... when people have to be their best... they can be. And that's what to believe in. Well... I'm really as close as this. Goodbye.

Jack explains his decision after becoming the new God

Jack Kline (b. May 18, 2017) is the son of Lucifer and Kelly Kline. He is the first and only known Nephilim to be sired by an Archangel. Jack was taken in by Sam Winchester and Dean Winchester who would teach him how to master his powers. During this time, Jack played a role in the resurrection of Castiel who he had chosen as his father.

Jack created his angels and beings to help him save people and left Castiel in charge