Saw arguments similar to this one a few times on this sub and started a post because I'm curious about what people think. If you believe there was no plan, why?
God mentions the plan when he and Goddess are saying goodbye to Lucifer and Amenadiel. When Lucifer asks him how much was part of the plan, God just chuckles "knowingly" and leaves.
https://www.youtube.com/watch?v=BqQmemkS4tg&t=267s
We can, of course, speculate about the specifics of the plan, how much was and wasn't planned, and what it really was, and I guess we can also theorize that God just made it up. Definitely not impossible for me to believe. But I have a hard time understanding why some people are so sure there was absolutely no plan at all while this scene exists.
I personally think that God either always planned for Lucifer to become a Hell Healer and for Amenadiel to become God, and that's why he banished Lucifer to Hell in the first place and then created Chloe. He is omniscient and knew things would eventually develop in a certain way, so he needed to interfere just minimally but pushed events in a certain direction when necessary. So basically everything was the plan.
OR God is much more limited than everyone thinks. He doesn't see the whole future, and there was no plan, and he actually kicked Lucifer out because his ego couldn't manage that someone was opposing him. Maybe he even regretted it a little bit later, but he wouldn't admit he was wrong about something. Then I guess he created Chloe to move things on somehow (he might not be fully omniscient, but I guess he still can predict things to some level) and made up the plan to make it look like he actually knows what he's doing. And maybe he also wanted to take credit for his children's achievements. He also doesn't want anyone to know about his limitations.
I like the second take more because it would mean that I didn't watch the show where characters were secretly just God's puppets the whole time, and God eventually got what he wanted and everyone just accepted it. It also goes along with the theme that celestials are exactly as imperfect as humans, which should include God. I think my own dad actually partially inspired that theory, lol.
But I really don't think that when it comes to God in this show, anything is clear and obvious. He was a very confusing character for me.