Well... Perhaps more original ideas for god powers? I really don't have much idea of celt mythology though.
eg. Truce/Double ceasefire way too overpowered, and besides if you cut it down to what the Greek ceasefire is, than you loose originality...
Great breeding is kinda like Odin's GP... quadruple herd with full fattening is really, really far too overpowered, I'm not really sure how you would make this one more original, you might need to rethink it totally like the one before.
Radiance - Quadruples harvest- OP version of rain... Not really that original...
Hunting god- GP- Animal Sight- briefly shows all non-military animals. This GP is really really OP two, much of the map will be scouted for you, and you know where all the hunting is from the start of the game...
Can convert enemy into sacrificial
prisoners at same speed as Set priests convert animals. This is a very slow rate, expect your druids to be dead before halfway... might make them a good meatshield though.
Military unit-Archers converted from villagers at cost like Ulfsarks: Villagers to ulfsarks is pretty uneconomical, especially if you want to do it so early...
GP-Tidal Wave - What happens if it is a map like Oasis?
Well there is my breif feedback I am at a bit of a mental block :P. I might come up with things tomorrow...
"The next turn I attacked those that had been attatched, fiendishly fracturing the friendly faction fraction"
-Wartrain. "Why not do the exciting thing and sit back, boom to a rag and use flaming weapons? - Who would have thought a Thor player could show this level of innovation?"
-Vagabond Tom.