[sourcery]

Multiple courts have maintained that while the property is private, its use is public and they cannot discriminate.

Sorry, but I'm not wrong, as can be clearly ascertained by reading the current controlling SC decision on the matter, Hudgens v. NLRB

[Truthsearcher]

I think the lawsuit should be over battery. If he did agree to leave peacefully but was then treated in the physical manner described, he has a good chance.

[jimtorr]

McReynolds said California's constitution actually is broader than the federal constitution with respect to free speech, providing protections to people in quasi-public forums such as shopping malls, as well as in public forums.

Under California law, you are still wrong. A case similar to this, though nothing to do with religion, was decided in California many years ago. The CA law has been tested.

[em2vn]

Sure you are. You are trying to compare equally the actions of a private citizen in a public place with the actions of an organization labor union at odds with a leasee. In the first case it is a conservation in the second it is a demonstration.
The two are unrelated.