But?
Liberalism by definition it seems at first, can't be dogmatic or militant? Yet this makes it too soft in the face of organized antagonism, armies.
It seems good to liberally allow all opinions, including religious zealots, here. But what happens when liberals are suddenly attacked by a conservative Nazi army, that wants to make you illegal, or jail or kill you, with no pleas allowed?.
There are times when being liberally tolerant of many or all views, is good. But when facing the Nazi army in WW II, should we have laid down our weapons, and been tolerant of Nazis?
For this reason, many became less liberal, and more firmly leftist. At least as a temporary response to organized right wing Republican opposition to liberalism.
In the past, whenever religious voices were freely allowed, they outnumbered and then excluded the atheists in this very group.
Are you sure you want to strongly encourage them to return? In the past, you insisted that you yourself were a victim of precisely that kind of exclusion, and in this very blog.