Secularism

n. belief in the separation of religious and civil affairs

Secularism is generally the assertion that certain practices or institutions should exist separately from religion or religious belief. Alternatively, it is a principle of promoting secular ideas or values in either public or private settings. It may also be a synonym for "secularist movement". In the extreme, it is an ideology that holds that religion has no place in public life.
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Noun
1. a doctrine that rejects religion and religious considerations
(hypernym) doctrine, philosophy, philosophical system, school of thought, ism

(n.)
The tenets or principles of the secularists.
  

(n.)
The state or quality of being secular; a secular spirit; secularity.
  

philosophy since the Renaissance, favoring human rather than religious values

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