If you own a completely private, family (or you plus friends) run business, then I think you have the right to discriminate in any you like. It is your business and your property, and you should not be forced to use it in a way you find objectionable. That would include both who you hire as an employee, and who you deal with as a client.
But, if, say, you are running a store, and you are paying rent or morgage on the physical building, that is not your property, and I do not think you have a right to keep people from it based on private feelings. If the bank owns the building, they get to decide who is allowed in, not you. So, that would nix any discrimination of customers.
If you took out a loan to start this business (I'm going to keep assuming a store, because it is easiest to work with) then that business does not belong to you until you have paid back the loan. Once you truly own the business, you may make any decisions about it, based on any criteria you like. But until that loan is paid off, the bank still has a grip on your business, and your primary duty is to be a good steward of the money with which you have been entrusted. That means, if you hire somebody, you hire people who will be responsible, hard-working and honest. If such a person is also gay, that is not your concern. Discriminating against a well-qualified person based on unrelated beliefs is something you may do when it is only your own money and possesions at risk, not somebody elses. So long as you are working on borrowed money, you should put person biases aside and work with whoever will be a good steward.
