Pass into the end zone and pushed backwards

Touchdown. As long as you have possession over the goal line it counts.

The argument someone is trying to make is that possession doesn’t take place until feet/body are the ground so if you jump in the endzone and come down at the 2 it’s possession at the 2. The example was given that if you jump in the end zone and come down out of bounds that it’s incomplete

Engineer go it right. It's about possession in the end zone, not where you're "down." You could even catch it in front of the end zone, extend the ball so it just barely breaks the goal line and then run backwards 30 yards and get a touchdown (the play would be over on review as a TD even with the extra antics). Once the ball "breaks the plane" with possession, it's done.