But they're already stronger than Kami-sama
I'm always up for a new animated Dragonball movie but the idea of god in the Dragonball world has already lost its meaning especially in the Japanese version since the nameless Namek was called "god". Then you had big ol' Yemma sitting at his desk to judge whether a deceased soul should move onto heaven or HFIL. Even the almighty Kais, Grand Kai and Supreme Kais are considered tremendously weak compared to the super saiyans during the Cell saga. Or Shin might have just been really weak compared to the other Kais since they could all handle Buu minus his regeneration and absorption abilities.
I just know I'm going to roll my eyes at whatever nonsense the old kai is going to make up on the spot.