Public atheists like Richard Dawkins, Susan Blackmore and Daniel Dennett have contributed to the erroneous perception that memetics is for non-believers alone. But no legitimate scientific discipline sets such a requirement.
Genetic science is broad enough to appeal to believers and non-believers alike. There is no cause to suspect the science of the second replicator would be less broad in its appeal. Just as in genetic science, the more people participating in memetic science, the stronger the discipline will become.
Some sub-disciplines may appeal more to believers or alternatively non-believers. Good. Let's work together.
Just as the biosphere is threatened by rapid environmental change brought about by human action, the memosphere is threatened. We are loosing survival knowledge, traditional technologies, languages and social networks. In thinking and behaving alike, we are limiting the variations which might empower our species to survive the environmental and social challenges of the 21st Century.
It's easy to become protectionist of a discipline which promises a cause-&-effect explanation of the cacophony of human culture. It's easy to be defensive about our personal understanding of the universe. But defensiveness just starts an emotional cold-war.
I'm not ok with sacrificing the few or the many to get to a better future. Encourage believers to look deeply into memetics. Don't turn them away or turn them off.
I assume atheists will make the most headway in memetics, but that's simply an assumption (probably fueled by my in-group bias). I look forward to someone proving this assumption wrong.
Most atheists are too protective to evaluate the scientific process in light of memetic theory, and perhaps believers will have valuable insights there.
Believers could also provide critiques of political and "rational" (non-metaphysical) ideologies and their manipulation of human will and social design. They could intuitively resolve dangerous and negative side-effects of their faith traditions while preserving the best innovations (something which outsiders can never do).
Finally, I appeal to you not to throw out the alliance of counselors, Religious Studies scholars and others who out of respect for diversity, personal relationships or a desire to educate instead of alienate choose to refrain from the deity debate.
We all have something to contribute to the conversation.
Memetics will be stronger if we work together.
Deny no one a seat at the table.