If they are a Humanist, then their moral/ethical system should be something fairly similar to the Amsterdam Declaration, or the Humanist Manifesto (the two primary statements of Humanist philosophy, pretty much saying the same things in different words). read more
Humanism (a.k.a. secular humanism) is a philosophy which in most cases embraces Agnosticism or Atheistic belief about the non-existence of a deity. But it goes further to create moral and ethical systems based upon reason and logic. read more
“Secularists” believe that laws and public institutions (for example, the education system) should be neutral as between alternative religions and beliefs. Almost all humanists are secularists, but religious believers may also take a secularist position which calls for freedom of belief, including the right to change belief and not to believe. read more