You might not agree with it, but there were lots of laws in the US that were, more or less, inherited from the Brits and their laws based on Christianity.  For example, anti-sodomy laws are of Christian derivative and were in every state up until 1962 when the sex perverts started lobbying for sexual freedom.  There is no reason Constitutionally why, with a conservative Court, all of the SCOTUS decisions that were legislative in effect on such issues couldn't be overturned on the basis of separation of powers.