Atheism means the rejection of belief in God. Secularism is a principle which rejects the notion of religious beliefs.

Secular means not concerned with or related to religion. Religious means relating to or concerned with religion.

Secularism is the principle that rejects religion, especially ethics. Socialism is an economic theory or system in which the means of production, distribution, and exchange are owned by the community...

Secular is a term defined as not related to religion. Laic is used to describe the absence of any religious involvement in governmental affairs.

Secular means not concerned with or related to religion. A sectarian is a person who is narrowly confined or religiously devoted to a particular sect or group.