Secularist (noun)

A person who holds the belief that religion should not play a role in government, education, or other public aspects of life.

Origin:

From latin saeculum "age, generation" + -ist.

Examples:

1. The politician was a secularist.
2. The organization promotes secularism and the separation of church and state.
3. Secularists believe that the government should be neutral on matters of religion.
4. The secularist movement has been gaining ground in recent years.
5. Secularists argue that religious considerations should be excluded from government policy.