Is 'Enchantment Creature' a creature type?
According to the rules, possible card types are:


  300.1. The card types are artifact, conspiracy, creature, enchantment, instant, land, phenomenon, plane, planeswalker, scheme, sorcery, tribal, and vanguard.


Agent of Erebos shares the type with Aegis of the Gods. However, Desendants' Path looks not at the card type, but on Creature Type:


  302.3. Creature subtypes are always a single word and are listed after a long dash: “Creature — Human Soldier,” “Artifact Creature — Golem,” and so on. Creature subtypes are also called creature types. Creatures may have multiple subtypes. See rule 205.3m for the complete list of creature types.
  Example: “Creature — Goblin Wizard” means the card is a creature with the subtypes Goblin and Wizard.


Aegis and Agent don't share a creature (sub)type, therefore you will have to put the Agent on the bottom of your library unless you control more creatures one of which is a Zombie.