Consider looking up the lawyer Peggy Hall. Religious discrimination is the way to go as the definition and case law is so broad that it essentially means deeply-held beliefs.

From what I can tell, in discrimination suits they'll try and pick apart an employee's grievances and show that there's no discrimination. With religious discrimination that's much harder to do as the burden of proof is on the employer. You don't have to attend church, read the Bible, or even believe in God to be discriminated against for your deeply-held beliefs.

I do agree that in the tweet she should have mentioned the type of discrimination