Agnès Poirier argues there is no postive or negative secularism, just secularism:
Secularism is neutral. It is neither a dogma nor a doctrine. If anything, it's an abstention. Secularism abstains from favouring one religion over another, or favouring atheism over religious belief. It is a political principle that aims at guaranteeing the largest possible coexistence of various freedoms.
(Hat tip: Norman Geras)