The first amendment has nothing to do with this. That governs the relationship between the government and "the people" and until incorporation via the 14th ame

The first amendment has nothing to do with this. That governs the relationship between the government and "the people" and until incorporation via the 14th amendment it didn't even apply to states and their citizens. It has nothing to do with the employer / employee relationship. Secondly I didn't see anything wildly puritanical about the statement. A lot of people aren't comfortable with that type of content and that fact could have affected the CEO's decision to fire the OP; because he didn't feel comfortable presenting the OP as the face of the company, which as the sales guy he was.