Indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.)
As long as your devotion to white (Each in the mana costs of permanents you control counts towards your devotion to white.) is less than five, Heliod isn't a creature.
Whenever you gain life, put a +1/+1 counter on target creature or enchantment you control.
: Another target creature gains lifelink (Damage dealt by the creature also causes its controller to gain that much life.) until end of turn.