So far it seems everyone broadly agrees with our god being a craft god of some description. I propose we call him a god of Art, at least within our propaganda, as this would be generally appealing to all creaftsdwarves while we can easily accommodate weapon buffs and so on.
The absolute first group we need to recruit to our cause are the engravers. It is the engravers who carve the story of our people into the walls, and so if we control the engravers we control the narrative of our history. Noble rooms will be adorned with stories of our rituals and beliefs, which should also assist in gaining access to powerful well-resourced allies.
For the god's name, I propose Ardezan, literally, the Author of Artifacts (I've removed an 's' in the transliteration). In our theology, it should be He that provides the divine inspiration for artifacts which allows us to take credit for a lot. Indeed, it is He that originally created Dwarfkind so that they could create art to please Him.
Some thoughts on what to add:
Miracle: Divine Gift
Ardezan bestows upon the world a great artifact. The artifact is of divine providence and not created by a dwarf and is chosen at Ardezan's discretion to satisfy our needs.
Cantrip: Illuminate
A work of art is illuminated in an aesthetically pleasing way. Engravings glow along carved grooves, gemstones glow, weapons and armour glean along their fine edges, and sewn images light up in the dark. Provides a source of light in the darkness, and inspiration for artists who will want to see their own work illuminated in this way. Mostly useful for propaganda.
Cantrip: Inspire
Clears the mind of doubt and drives artists to pursue great works. Increases the motivation of craftsdwarves (i.e. less slacking off) and improves the chances of creating higher quality works.
Cantrip: Animate
Animates an engraving or statue. This can be done for artistic purposes (i.e. propaganda), or to create a golem-like creature to conduct manual labour for the dwarves.
Ritual: Weekly Mass
A simple ritual which runs for about 30 minutes, where the worshippers affirm their faith in a temple richly endowed with beautiful art and engraved walls and floors. The stories of the faith are engraved all around the room and the priest may animate one to show the story of our faith. All Masterwork art produced by worshippers that week is then presented at the altar (which is an anvil) and blessed. This art may optionally be donated to the temple, where it will be put on display for precisely 40 days before being donated to the poor (enhancing recruitment). Soldiers may ask for blessings for their weapons and armour. Worshippers then affirm their faith and praise the glory of Ardezan.
Ritual: Masterwork Funerals
If a Masterwork craft is destroyed or defaced a formal funeral is held for the piece where its remains are interned in a coffin within the temple catacombs. If the remains cannot be recovered a small slab is engraved in its memory. After 40 days an engraving is commissioned to commemorate the artwork within the catacombs.
Ritual: Weddings
Before a wedding the parents of each the bride and groom must give half the bars required to produce an alloy to the priest (so, groom's parents give copper and bride's parents give gold for rose gold). The priest then has the bars smelted together to produce an alloy, and worked into a great work of art that represents the coming together of the couple and their bond. On the day of the wedding, which is commemorated in the temple, the priest then presents the work of art to the couple. All who attend then praise the glory of Ardezan.
Ritual: Steel Purification
On the first day of Moonstone the temple enters a period of commemoration. The main gate is closed to the public, leaving the weekly mass to be conducted outside briefly. Once we turn the aristocracy to our cause they will also close the main gate to the fort, though side passages will remain open and can be used by those who need access to the outside. This marks the beginning of a 20 day period of mourning. Dwarves are expected to visit the graves of the deceased (especially those who fell in battle) and place high-quality crafts within their tombs for the spirits to admire. Within a back room of the temple iron is smelted into pig iron, which symbolises the hardship and suffering of life which causes the iron to become hard and brittle. After this 20 day period a new 20 day period begins, where the pig iron is mixed with iron and turned into steel. This represents the skill and strength that comes from surpassing life's challenges. During this period dwarves are expected to hone their crafts, or practice a new craft if they do not currently have one (does not need to be as a profession). The priest then selects a particular member of the fort whose achievements are worthy of celebration. A number of the religion's finest craftsdwarves are notifed and a full suit of clothing (or armour + weapon, if a military dwarf) is crafted in their honour, adorned with holy symbols. On the 40th day the temple's doors are reopened and the recipient is awarded his/her masterwork attire and a feast is held in their honour, and to the glory of Ardezan.