John Locke
Why?
...because
1. His reasoning for "Religious tolerance"- (1) Earthly judges, the state in particular, and human beings generally, cannot dependably evaluate the truth-claims of competing religious standpoints; (2) Even if they could, enforcing a single "true religion" would not have the desired effect, because belief cannot be compelled by violence; (3) Coercing religious uniformity would lead to more social disorder than allowing diversity. John Locke, Letters Concerning Toleration (1689–92)
2. His belief that societies should be "civil" and that the "State of Nature" is a rather materialist bi-product of human nature and is a discredit to humanity; (not so much in those words.)