Extreme Secularism seeks to exclude the concept of religion from the discourse. In my opinion, extreme secularism would not allow concepts concieved under religions teachings to even be a part of the the discussion. Its an active dissection of the language and the culture to remove references to Natural Law, Religious Cannon Law, Biblical Teachings etc. from the vernacular and make the concept of Moral Relativism the central theme. The removal of any absolutes based on any moral teachings run contrary to the Extreme Secularism view. Not sure you'll find a Wikipedia Page to support that

but that is my opinion. .
Secularism does not seek to silence the religious voice and will allow discussion, but claims to not base its thesis on religious teaching etc. Its the silencing and attempts to discredit, marginalize, dismember, nueter or out and out delete religion that makes it extreme.
Other than that, its more secularistic in its secularocity.
Deo Adjuvante Non Timendum - (with the help of God there is nothing to be afraid of)
Spectamur Agendo - (We are proven by our actions)
Non Ducor, Duco - (I am not led, I lead)
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