Manners and etiquette guides emphasize the importance of leaving politics (and religion) out of social scenarios, and this philosophy especially applies to your business. Your personal opinions and beliefs should be left out of your workplace because, no matter how politically correct you approach any given topic, someone could potentially be offended because of a differing perspective or viewpoint. As a business owner, you should be open and receptive to a diverse population of clientele, and you would not want your opinions to deter any prospective clients.
This philosophy supports a welcoming environment, and you will avoid the risk of polarizing a population with a particular view or belief. Remember, the success of your business depends on mutual respect for others.
Here are some great articles regarding the topic: