What these persons fail to understand is that it would have been redundant to include such a phrase [separation of church and state] in the Constitution. The document as a whole embodies the view that government is not to meddle in religious matters. The federal government is given very specific, limited powers only over various secular matters. It has no powers relating to religion. The government is secular both in its origin (the consent of the governed) and its function. The government and religious institutions are completely separate and have nothing to do with each other. To insist that the Constitution doesn’t mandate separation of church and state because it doesn’t contain that phrase is more preposterous than a person who is not named as a beneficiary in a will insisting he has a claim on the estate because the will does not specifically exclude him by name.
— Dr. Ronald Lindsay, The Necessity of Secularism: Why God Can’t Tell Us What to Do, December 2014