I often complain about the scarcity and relative lack of influence of liberal Muslim groups. Nevertheless, they exist, and secularists and infidels should hope that they get stronger. They are natural allies. For example, the mission statement of the Muslim Canadian Congress expresses liberal-minded convictions that any secularist can celebrate.
I point out such organizations especially because lately I have often run into the sentiment that liberal religion is merely a weak-kneed cover for more fundamentalist faiths. Well, not really. Life is complicated, so sometimes liberal religion does excuse the nastier variety of faith-based attitudes. But by and large, liberal religious people are politically closer to nonbelievers.