While I will let building a shrine of Ares slide because no one likes Ares :lol (my idea was that at the emergence of the "modern" religions, the Athanatoi decided to cease from interfering with human affairs unless something in the past that they did has come back around to bite Earth in the butt), I'm not quite sure how I feel having Hephaestus helping Ares build his "shrine".  Ares was the jerk who banged Hephaestus' wife (Aphrodite).