Since the Lizardmen are agnostic, they need something to make up of no religion. This is my idea to depict their worship, while denying them access to religion.
The Lizardmen Pantheon
The Lizarmen worship a plethora of fallen angels. There are five main angels who dominate the others. All the gods have a domain, not a sphere, as they are not true gods.
The Wild One
Name: Outizotl
Original God: Cerunoss
Domain: Beasts
Backstory: When Cerunoss was appointed God of Nature, a number of angels from other gods, particularly Sucellus, came to serve Cerunoss. Unfortunately, not all were satisfied with his ways. Outizotl wanted Cerunoss to be more aggressive, and make the beassts of the wilderness attack civilization. Angered at his refusal, Outizotl left his service, where she found the Lizardmen, half man, half beast, ready to overun the enemies of the wild.
Benefits: Outizotl's Temples focus on making jungles and marshes produce more food. Also, she helps recon units by giving them Subdue beast and animal.
The Shaman Queen
Name: Alipatl
Original God: Ohgma
Domain: Betrayal
Backstory: Alipatl was one of Oghma's most powerful students. She worshipped Oghma dutifully, and did her bidding. But when Oghma was forced from her land by the compact, Alipatl would not leave. She loved her mistresses’' realm too much to leave it untended to. So she left her godess' side to teach those in Erebus about the Magic ways of her mistress. But over the years, Alipatl decided she deserved more from Oghma. so she left her service and found thoe willing to serve her.
Benefits: Alipatl helps with the production of Arcane units, and gives them a starting sphere. She also makes jungles create more gold, through magical animation of plants.
The Blooded Lord
Name: Quezotlaptl
Original God: Aeron
Domain: Blood
Backstory: Quezotlaptl's story is very similar to Odio's. The only difference is that Quezotlaptl escaped destruction by other gods, and found his own people.
Benefits: Quezotlaptl's temples make melee units stronger and more quickly produced. His brutal ways cause your Lizardmen to make their slaves work harder on hills.
Keeper of the Flame
Name: Hallicatl
Original God: Bhall
Domain: Fire Mana
Backstory: Hallicatl fell with her misterss, but seeing Bhall in a coma, Hallicatl
abandoned his queen to find his own people. He, along with the others of pantheon, found a small valley in the AoI where the Lizardmen hiddled around a fire mana node, and found his way.
Benefits: Hallicatl has the most powerful disciples in the game. They are the only disciples to have three spheres of spells.
The Stone God
Name: Orzinopl
Original God: Kilmorph
Domain: Mountains
Backstory: Orzinopl wasone of the weakest of Kilmorph's angels. He created a tranquil valley where he dwelt. When she left creation, he longed for the valley he had dwelled in peacefully. Eventually, the longing for the Valley he owned overcame him and he fell from heaven, straight to his valley, only to find other fallen angels nwatching over a tribe of lizarmen.
Benefits: Orzinopl makes mountains in your BFC produce . His servants move double speed over hills.
So the fallen angels came together to help the Lizardmen. The five angels do not like each other, and will not tolerate sharing worshippers with each other unless forced. In order to create a fair enviornment to gain folllowers, the five angels made an agreement to not actually appear to the Lizardmen, rather causing miracles and watching from afar.
Temples
Temples of the gods’ become available at mysticism. Only one temple can be built in a city. Once one is built, the other four are blocked.
The Wild Grove
All recon units are given Subdue Beast, Subdue Animal
All marshes and jungles produce +1

+1

, +15% Culture
Temple of the Stone God
All melee units start with fortification
All Mountains produce +2

+1

, +15% defense
The Sacred Flame
All Disciple units start with medic II
All flames, snake pillars, produce +3

+1

, +20% Disciple Production
The Blood Pyramid
All melee, archery units start with combat I, blitz
All Hills produce +1

+1

, +15% Military Production
Shrine of Alipatl
All adepts start with Chaos I
All Jungles produce +1

+1

, +20% ritual production
Disciples
All the gods get their unique priest at priesthood. The priests require the temple of their god to create. All disciples can destroy the temples of other gods in cities as well as foreign religions. There are no inquisitors, but there are high priests, available at fanaticism, but there are high priests, available at fanaticism. All disciples, no matter what god, upgrade to the High Priest. This unit has access to tier three divine and Sorcery spells, as well as increased strength.
Base strength is 4, movement 1
The Disciples are empowered by their deities.
Beastsinger
God: Outizotl
Spheres: Nature
Unique Ability: Double Movement in Jungle, Forest, Starts with Subdue Beast, Subdue Animal
Arcane Priest
God: Alipatl
Spheres: Chaos
Unique Ability: Starts with Sorcery, not Divine
Deathly Disciple
God: Quezotlaptl
Spheres: Death
Unique Ability: Starts with Death I & II, +1
Flame Keeper
God: Hallicatl
Spheres: Fire, Sun, Chaos
Unique Ability: +2 :Strength:, + 1
Stonemaster
God: Orzinopl
Spheres: Earth
Unique Ability: Fortification Bonus
Thus the Lizardmen would have their own system of religion, which would make up for their agnosticism.