Since Serpents don't seem very tied to spiritual/religious RP, I don't think it's outrageous to multiclass Serpent/Shaman. The only problem I'd foresee is that your PVP might suffer, since Serpents are Dex-based and Shaman more Con/Int based.
I am posting this here so the spiritlore thread isn't derailed again.
So its been bothering me, why would my PVP suffer, as far as I understand it, you will only be one class at a time with multiclass right? So as a Dex based Raja I can be a decent PvP serpent and just be shaman for rp. And how I see it this would be the case for any multiclass serpent since they are the only class that is dex based, or is this going to change soon?