I have a personal question that I prefer not to ask publically

It is about where to find  regulations regarding people handing out political information of a religious nature inside the post office, during business hours..  

Yes, there are several postal employees in the PBS threads.  Staff has less control over what happens outside the PO (we used to have some strange political protestors for awhile), but generally that doesn't sound like something that should be happening.  Did you bring it to the attention of the postmaster onsite?  If that didn't work, you may wish to contact the regional administration office.  You may have to do some research...or ask an employee, which admin office is above your local postoffice.