I think real scientist is neither atheist nor believer. Atheist and believer (specially organised religions) have very similar state of mind. They both think/feel very similar reality eg. god is not there/god is there. Both exact same effect in mind.

On the other and a scientific mind is always in the state of dont know. Its curious how the things are as they are and moves from unknown to unknown. If this mind involved in exploration of the very existence of consciousness/awareness the you can call it spiritual mind.