Conservatives adhere to the Constitution.
Whether or not they adhere to the Word of God is the choice that God has allowed them to make.
Fortunately, there is very little conflict between the two, however in the case of a conflict I will always put God before the Constitution. In that regard atheists may make better conservatives.
On the other hand, Christians and Jews know that their rights come from God and that the Constitution doesn't grant rights, but rather limits the power of the governemnt. Atheist conservatives know that the Constitution limits the powers of government, but the source of their rights is a little more of an obscure subject. In that regard Christians make better conservatives.
Conclusion: Atheists are a slightly different type of conservative, but they are neither better nor worse conservatives that Christians or Jews.
I never found Natural Law to be obscure.
But your point is understood, nonetheless.
Don't you find it the least little bit odd that many social conservatives can live so close to the constitution, yet they have trouble walking in the word becasue no ones perfect?