Is there a law broken since I was being transferred for religious reasons and why?

I work for the federal government. The agency that I work for limits a person from moving to another office within the agency, except for a promotion or a hardship transfer. A hardship transfer is for example if a person has to move to another location for health reasons and treatment purposes and or if a spouse relocates causing the person to have to move to be with their spouse etc. I put in for a hardship transfer to move and attend a Theological Seminary. So I applied for a hardship for religious purposes and I was denied. This denial was at the end of June 2014. Is there any legal action I can take or is there any law that would allow me to transfer for religious purposes. I realize every job has their own rules and policies but I am not sure if I was treated fairly. They approved two hardship transfers after mine, however they were not for religious purposes but they were approved. Again, I am not sure what action I can take to get this transfer. I am wondering is there any law that was broken that prevented me from being transferred for religious purposes?