A Simple Rule

[Mister Agenda]

There is certainly discussions between liberals regarding religion - However I take it that you're using the American meaning of liberal. As far as I know, here in Portugal the far left party (aka Communist party) openly states positions against religion and theism anytime they are presented with an opportunity, and it is somewhat common - But moderate socialists, aka center left, have differing views, even though most support secularism, the problem is that they have a weird obsession with protecting minorities and traditionally discriminated groups, and this includes protecting Muslims, JW's, and so on.

To further confuse matters, someone who is politically conservative may be religiously liberal, vice versa, and all other possible combinations. Religious and political liberalism are often correlated, but frequently are not. I'd say they're on different axes.