Paganism is so diverse I'm sure there are some who don't. But there is less of a need for such a movement in Paganism. Most Pagans (in my experience...if I'm wrong please correct me) I know tend to take a more metaphorical approach to deities (but of course, some Pagans do literally believe in them). Not to say they don't exist, just not in a literal way, like many of the ancients would have believed. They tend to be conceptualized (more or less) as energetic manifestations of (or related to) certain natural forces/concepts. Archetypes or distillations as experienced by a person or people. The "spirit" (word used metaphorically) of a thing if you will. To be an atheist pagan is more or less to choose not to channel those archetypes in your rituals. Is that what you mean? In terms of symbolism at least, gods are are a central part of most pagans' religion (as far as I know, if I'm wrong please correct me).
I think (at least this is true for my spiritual path in particular, though I'm not Pagan...leaning somewhat in that direction though) for many pagans it isn't so much belief in a literal, scientific sense that matters. There is a kind of a thirst, a hunger for living out ones religious impulses, which I believe have origins in biology. It's about the experience of religion, the symbolic meaning (and for me, as a "mystic", direct contact with the divine, or Holy Spirit as I call it, whether that is "real" scientifically or not). Our ancestors may have literally believed in these things. Science today makes it hard to accept some of these teachings...but only in an objective sense. The mind is more real, in some ways. (Everything is perceived in a simulation.) The drive is still there, so I think there is spiritual meaning in it, a "truth" beyond fact, if you will. From that perspective, it isn't really problematic to say gods exist, and to say so might make your religious experience more powerful. Pagans tend not to believe in gods, say, in the way that Muslims believe in God/Allah.