Reconciling (seemingly) contrary beliefs

At a recent event at the Secular freethought Center one of the persons attending happened to be a Ralian and a humanist. At first I was taken back since I didn't see how one could advocate searching for knowledge via evidence (humanist) with the belief that aliens contacted some guy and told him unverified truths (Raliens). So yes these are contradictory, but it is a much smaller step than the people in the big religions make. In Islam, christianity and Judaism they all have, "Thou shall not kill" but through some twisted logic get holy wars and "just" wars!

I think some people will always have some small degree of nonsense they believe (god, Santa, recycling paper saves trees) and all we can try to do is provided them with enough real knowledge that they feel less and less compelled to have these beliefs. They say set your sites high, so how's that!