While we're talking about the subject of constructing religions, I'd like to bring up the concept of the Creed. The creed is nothing more than a simple statement of the religion's beliefs, meant to be recited. If you cannot write a creed for your monotheistic religion, it probably needs work on internal consistency. Creed examples:

The Crown Princess of Sadaren needs a husband! There's just a few teeny little problems.

This ice-crafted armor is a gift from the three-aspected Goddess of Water to her chosen.

A summary of the tools, weapons, and transports of the Kel’Regar.

'A man needs two things to become a saint. He must perform three miracles, and then he must die. Perform your miracles, sir, and come to me when you are ready to become a saint.'
—Azariah Saintmaker, Dread Lord of Hatred

All know that Elves cannot die, and that Men do. All know that Men go unto the Underworld upon their death, and that the Elves retire unto the Spiritual Elysium. Yet in the Great Scheme, where goes the one with one foot in the Underworld, and one foot in the Realm of Spirit?

Strange plant-creatures from Rosetta II, the Rosahomin are, for a small portion of their lives, roughly humanoid creatures, fully sentient, and capable of interacting with the galaxy.

A druid obsessed with Nature's cycle of death has created a horrendous spore in a plot to rid the lands of a swiftly growing town that has begun to encroach upon his forest.

It's round. It's silvery. It's got a handle. It's been used to make a million excellent meals, and even more dogs. It's also got a face shaped dent in the bottom.

A dark dagger of song, forged for vengance. It shall have that vengance.

Though each drone possesses little intelligence of its own, together, they are the Kth'k'k'kt, who span the stars.

The high ambassador of the Kel’Regar to the Earthling federation, the unearthly Ku’ar’Riss is a terrifying creature to behold, her desires as dark and alien as her skin.

These small, luminescent creatures are a distant relative of the willowisp, little bits of orangish light that are attracted by the flames of a fire. When enough of them have gathered around a fire, the fire appears to take on a fuzzy indistinctness.

The proper names and descriptions of a sword's parts.

A mid-sized sailing ship with an embedded Shard of the Storm.

Centaur-crafted marching drums, imbued with firey power.

Undead abominations born of the Light, the glow of the Accursed's warped flesh strikes terror into those who behold it.

Taronia - Land of mystics and sages. Taronia - Land of the Gods. Taronia - Land of Conquerers.

War has begun, and the troops have begun to move. Lying on the border between Esteov and the God's Spine Mountains, Kerrengen Keep secures the main source of fresh water for the capital of Esteov, Lake Kerrengen.

The result of a disastrous summoning accident involving a fire elemental, a pig farm, and a farmer's daughter, bacon elementals can only be described as delicious.