[quote=@Pyromania99]
That being said. . . It'd be kind of funny if Heph would go to hit with the hammer and my char blocked it with her shield. 
[/quote]

I, uh, I heavily advise against trying to go toe-to-toe with Heph. She'll get mad and hit you for real. 

That said, if you've cleared the personality hurdle and ruled out the majority, as you have, I'd say decide based on a party role. Currently we have a Hermes for mobility/agility/economics, a Cernunnos for ranged/concealment, and a (tentative) Ares for frontline offense. 

Thoth is mainly support-based with potion creations. Heka's singlemindedly focused on magic. Vishnu's the "tank" Guild. 
Pick whatever you think coincides best with your theme/suits the party best. The blessings from your God will dictate a decent chunk of your skillset, after all, especially later on.