Hey, do you love worshipping God? Me too, but I'm honestly sick of worshipping the same one.

Instead of having the player get charismatic, chosen one and big brain, just scrap them all and make a custom trait like 'Celestial' or 'Demiurge', giving a smaller buff of something like +10% unity and immortal.

Late game, the player can talk to the shroud and with the chosen one event, you could make it so giving it to your 'God' will, instead of giving it chosen one, another buff on the lines of 'Awakened Demiurge/Celestial', with slightly stronger buffs to that one, with the other buff included. Something like +20% unity, +25% Gov. Ethics Attraction, +1.5 monthly influence and the immortal trait.

To make it even more interesting, when your 'God' ascends, if there is a spiritualist fallen empire, they can demand that they save your ruler from you. Saying yes means you don't go to war, and your ruler starts life as the ruler of said fallen empire. Saying no means war, and your God getting taken anyway if you lose.

This is something that'd make the origin far more interesting. But in all honesty I won't hold it against you if you don't, cus programming events in Stellaris is scary.