Ok, I had just received the power that lets you move sand and made it back to the main hub of the level, the area with the giant sun dial.
I used the sand power to get into the cave with the bird head with lava coming out of it. I retrieved the final piece of the sun dial, went to the area in the cave that lets you look out onto the sun dial and used the sand power to get over the lip and drop down into the main area.
I placed the last piece of the dial, restored the dial in God form, then went through the door to exit the level.
I’m guessing the final God power was down the path to the left from the main area. I got to the point with the bolted door and the infinitely respawning enemies and assumed I needed some other ability or something to get past that locked door. I’m guessing now I was supposed to go into God form and get the enemies to attack the door? I’m still not sure what I was supposed to do there.
It seems that there is a glitch with that area, as well. When I saw the enemies were infinitely respawning there I gave up and went down the other path. When I came back later I killed the enemy that had come to the entrance to the cave, but no more enemies spawned there. That’s assuming I needed an enemy to get through that door.