Why do you think that god won't allow anyone with a disability of any kind to be a priest and make offerings? [Spirituality & Religion]

From what I understand, they could teach, but they could not serve in the temple. The Leviticus laws and rules are very specific, very exacting and very representative of the expectations of the Lord. Hard to live up to and fulfill. Thankfully, in the death of Christ the law has been fulfilled and they no longer apply in ways people seem to feel they do or should.
I suspect it is because of what the priests of the temple represented. He was to be without blemish. Priests were held to a higher standard than anyone else.