Calvinist belief in OT Holy Codes

[Joe Brummer]

Just out of curiousity, many christians divide the "holiness codes" of the bible into moral, civil and ceremonial. Others feel there is no scriptual justification for this division. Many fundementalist christians use this (IMHO) as justification of how they can still use Leviticus and other old testament laws as reasons to find homosexuality immoral. The claim is that the civil and ceremonial laws were wiped out by the new covenant but the moral law still stands.

Does anyone have a thought about this?