Secular Left
Opposite of the religious right. Openly hostile to religion. Ignores freedom of speech to try to remove religion from the country and ultimately the world. Against death penalty because "Human life is sacred", but supports abortion! Honestly thinks that morality is relative and that the only people who would vote Republican are "closeminded religious fundamentalists who love guns and hate gays". The secular left is the most dangerous movement around today. Two large proponents of the secular left are Barbara Boxer and the ACLU.
The secular left is the most dangerous movement in America Today.
Secular Left
The secular left is a group of left-wingers (ranging from the center-left to far-left) who support secularism. While the secular left is just that, and has no defined cultural or economic values, secular leftists (in the west at least, often) hold socially progressive and culturally liberal values such as supporting abortion rights and lgbt rights due to the religious right's opposition towards such.
The secular left is noted for promoting culturally liberal worldviews to spite the Christian right. Although, just like the secular right exists, you can be on the secular left and conservative or progressive, although most of its followers in the West are progressive socially.