Questions first, then backstory.
1. Are non-core deities (namely - Milani) more powerful than core?
2. What is the impact of restricting a cleric to having (at most) one subdomain?
3. There are Dwarf only spells, and (fluff restricted) spells from race books... Are they over-powered?
3x. Summon Ancestral Guardian, Ancestral Gift, Blood Rage - are they too powerful for their level and need banned or adjusted?
4. I'm facing difficulties as a player interacting with my DM, what should I do to facilitate freedom and fun for me and peace with him?
Backstory (or, "bs"):
I'm not new to dnd, but am participating in my first campaign (so I never played, but am familiar with the system). The group I joined was 7th level characters in the Rise of the Runelords setting (no spoilers please), 8th lvl when I got to make my character.
I came in as the party's cleric (named "Doctor") was leaving,
required to make a cleric. This was difficult at first as I personally believe the need for a deity is a crutch in a world where magic can simply be born, but I did the work - found faith and drank the coolaid.
The rules for my creating a character were that it be a Cleric, must have deity, can use any Paizo source.
So I studied and made spell cards from a generator creating all cleric spells from all books available ( but not 3rd party stuff).
Apparently I'm what they call a min/maxer (a term I'm familiar with, as I'm a comp&console gamer). Though I disagree, it seems to be causing problems with the DM. Many of the ideas, combos, spells, various choices and whatnot that I've found from scouring the books (core, ult. Magic/combat/equip, race books, faiths of balance/purity/corruption) and the pfsrd have been knocked out on DM caveat.
Some agreed as fair, some seem unfair to me - some even biased against me.
Some rulings so far:
-can't pick two subdomains (cleric of Milani with Defense[protection] and Restoration[Healing] domains) -> reason: Miani is a 3rd party deity that is more powerful because it was added after core. And having those two domains is two powerful, proof (he states) is that I chose them.
-Ancestral Gift is more powerful than any other 4th lvl spell and (was modified, now...) is disallowed because I'm not a dwarf. (from Dwarves of Golarion, says it is not a dwarf restricted spell)
-no eastern weapons from ultimate combat (or was it equipment?) Because they're all over-powered.
...I'm having trouble dealing with having the rug pulled out from under me (there are other issues, but I plan or expect something to work within the rules - then he changes them), it is becoming less fun to play because of this.
I don't know what to do (besides manipulating the DM to personally like me more, which I can do but find unethical), please help.