An Art Degree, a BS in Engineering degree, or most any other degree is a common platform that all practicing professionals need. If I want to teach History, chances are I'll need a degree in History.
That said, if I want to be a Luthern (or other random group) Minister, I'll need my Divinity degree. However, if I want to be a Catholic Priest, I have an entirely different route. If I want to become a Mormon Bishop (or similar function) there is no requirement to attend a Divinity School. Yet, these people pay taxes; but by the very definition of their religion, are denied the benefits that their taxes go to.
A Buddist Monk does not go to a Divinity School, but rather choses a way of life. So, by granting taxpayer scholarships carte blanc to Divinity School students, you are showing preferential treatment to those religions that have such schools.
The Supreme Court ruling, as I understand it, deferred to the State the ability to differentiate who does, and who will not receive scholarship tuition funding. This is as it should be, in my opinion.
And by giving ANY kind of aid, I am showing preferential treatment to extreme left ideology which is 'preached' is universities across this nation.
I still don't see a reason to single out divinity degrees. It is not the Lutheran's fault that the Buddhists don't require a degree. If the Buddhists are bothered by this, then let them change their criteria to require a degree.