Can we talk to whoever is above the parish priest?
The general rule of employment in California (and everywhere else in the USA) is that an employer can terminate an employee at any time, for any reason, or for no reason at all. Cal. Labor Code 2922.
You can contact anyone in the chain of supervision in the school that is willing to meet with you. However, the employer has no obligation to meet, or to give you any special treatment, other than that which is promised to you in the employer's written policies.
So, while your contacting a high-level personal in the church may provide you with some remedy -- it may not -- and if not, then you may have no recourse at all, even if a lower-level supervisor becomes angered by your going over his/her head.
In other words, you could be risking termination by your actions. But, from what you describe, you may be on your way out the door already, and if so, then you have nothing to lose by approaching a higher-level person for assistance.
Hope this helps.
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