Bork, the Mad God.
By choosing this religion, you will be able to summon Woodens (the long-arm of Insanity) to your side in battle.

When looking at Woodens, you could be forgiven for believing that they are possibly weaker than Demons.
Their offense and attacks are lower than Demons and their cost is greater (100 Fury to conjure), However, their HE is higher than Demons at 100, and their size is slightly larger so as to draw more attacks it's way, but more importantly, the Wooden "cloaks" your Lessers when they share the same region, the same as a Dead Forest would.
Dead Forests in return cloak Woodens as well as Lessers, so you can see for launching sneak attacks, they are unmatched.
Woodens also protect your Lessers from dying on Dunes Regions.

Woodens are a good solid choice for "cheaper" forms.
They are perfect for sneak-attacks and mis-direction, Nothing hurts more than a Wooden bursting forth from a Forest with 500 Rip Lizards hidden under it's bows.

Again, make the most of it's special attributes, be sneaky, hide men with it, even hide the form as it crosses plains & Dunes between forests, having it suddenly appear where your enemy is not expecting it can be a great advantage.

Bork is a popular choice of form, they stack well & you can usually pump several out in a short time due to their relatively cheap cost.
another thing they do well is bulk up quickly & they can become a formidable beast as the game progresses.