I think that you have a very interesting basis for a fun character.
However, I don't think we can help very much because a /lot/ of what you are asking for/planning on is GM dependent.
We can start with Syncreism. I am actually playing a cloistered cleric right now in a game on the boards who took that at level 2. The mechanical reason for it was the fire domain, but it also made a ton of sense with my RP. (My first deity is Tlehar, and I took Syncretism with her brother Chohar). It made mechanical, thematic, and RP sense, so the GM allowed it.
Will your GM allow it if the only reason you do it is to get a new weapon? I don't think any of us can answer that question.
Now, Splitner Faith is very problematic, from both an RP and mechanical viewpoint. From an RP perspective, you are worshiping your deity from a viewpoint that most see as heretical, and then you plan on spreading it out even further. This could lead to significant RP issues.
On top of that, there are two mechanical aspects that are worth noting: the first is that *any* domain spell you cast that is not on your specifically selected domains list is Heightened to one level lower thn your max, and second, if you do not take this Feat at level 1, you can *only* take it via Retraining, meaning you have to give up one of your earlier feats to get it.
While I can't say what your GM would do, I would likely say no to Splinter Faith in this case. One of Suncretism/Spinter Faith if RP supported it, yes, absolutely. They're both very fun and nice things to explore. Both, probably not.
Finally, will your GM ignore your Taunts? None of us can answer that. That is something I would urge you to discuss with your GM before making the character. Some GMs do not like anything like tanks or taunts, which I've never understood. If yours is that sort of GM, then this concept - which, again, feels very interesting - will fall flat.
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Finally, will your GM ignore your Taunts? None of us can answer that. That is something I would urge you to discuss with your GM before making the character. Some GMs do not like anything like tanks or taunts, which I've never understood. If yours is that sort of GM, then this concept - which, again, feels very interesting - will fall flat.
OTOH this is still an 8 HP class without the Guardian's defensive bonuses/proficiencies. Not ignoring the taunts means suddenly being the primary target without the extra defenses that are expected of someone doing that.
That's the biggest concern I see: if the taunt works and the BBEG is suddenly coming after you, you're functioning like a Guardian without the Guardian's built in tankiness. That could be a real problem if it has Reactive Strike and spellcasting becomes dangerous since you lose that as a way to get yourself out of trouble.