1. Clerics can't take inquisitions, those are for inquisitors only.
2. If you want more fire spells, take the Fire domain and prepare multiple Burning Hands.
3. If you want to be a blaster/summoner you'll want to crank up your Wisdom and Charisma pretty high. Wisdom will help with your spell DC's and Charisma will help when you're doing more powerful summons later on. Spell Focus: Conjuration and Augment summoning are highly recommended as well.
4. Consider going for the Diabolist prestige class, as the themes of that class and your character concept coincide quite nicely. Link: http://www.d20pfsrd.com/classes/prestige-classes/other-paizo/c-d/diabolist
5. Use metamagic feats to increase the versatility of your blast spells.
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OmegaZ, there are some errors in your post.
1)Clerics can take Inquisitions.
Inquisitions are intended for inquisitors, not for other classes that give access to domains. While a cleric or other domain-using class can select an inquisition in place of a domain (if appropriate to the character's deity), inquisitions do not grant domain spell slots or domain spells, and therefore are much weaker choices for those classes. These other classes use the appropriate class level as their inquisitor level for the purpose of inquisition granted powers (clerics use their cleric level as their inquisitor level, and so on).
2) If you want to prepare multiple domain spells, you have to take Theologian. Clerics can normally only prepare domain spells in domain slots. Theologian allows you to prepare then in normal slots. Otherwise you are stuck with one domain spell per spell level
Go Fiendish Vessel all day long.
Go Fiendish Vessel all day long.
This! Have a player who's a Fiendish Vessel in my Way of the Wicked campaign and he's one of, if not the, biggest threat I have. So much versatility.