ETB

[DylanW18]

If I have a {Soul Warden} out, and play a {Heliod, God of the Sun}, but not enough devotion that he would be a creature, do I still gain 1 life?

[DylanW18]

Thank you! +1!

[Coffee Vampire]

yes you do.  He hits the battlefield as a creature and everything that cares about creatures trigger, but after that, he is not a creature.  just like how he's a creature on the stack or in your hand.

This is incorrect. Straight from the wizards website:

Each of the Theros Gods has indestructible, and each one is a creature only if you have enough devotion to its color. If a God enters the battlefield while your devotion to its color is less than the required number, abilities that trigger when a creature enters the battlefield won't trigger. If a God on the battlefield is a creature and your devotion to its color drops below the required number, it immediately stops being a creature. A God can't attack the turn it enters the battlefield unless it has haste, even if it wasn't a creature as it entered the battlefield.