I pretty much didnt understand how this class work, keep dying before lair
Cinder Acolyte is a mage with a weapon, not the other way around. So, pick a spear at the beginning (you will start at 1.0 attack delay due to its low skill requirement) and get Scorch to 5% failure rate. Then, get some stealth, fighting and dodging.
Ignis’ abilities are very powerful but won’t help you if you’re one hit from death. Use them early on. Fiery Armor costs less so you should focus on using it but sometimes you will have to summon Foxfire Swarm.
CA is pretty bad as it doesn’t have a clear path forward compared to other book starts. Scorch is nice but its damage becomes too bad later on. Look out for spells and weapons in the dungeon, and be ready to pivot to something at some point. Maybe you’ll get a great randart morningstar, maybe Frozen Ramparts or OTR, maybe rimehorn talisman.
I think the recommended time for switching gods is by late Lair or something like that. I definitely wouldn’t try to switch before Lair.