Both?
Well, sure! There are certain questions we human beings typically ask for which science has no answers, and although science knows it does not have the answers it remains curious. The creation and how it came to be is one such question. Even if we accept science's Big Bang, the quesion: "And what was before the Big Bang?" remains unanswered--totally--no data whatsoever.
Religion, on the other hand, addresses the same question and provides answers but without the data. In the place of data there is faith.
To a scientist, data are limited to being a product of the scientific method. Scientists are well aware of this limitation and, thus, know there are existential phenomena (e.g., Cogito ergo..., etc.) for which data cannot be found. Thus, scientists know they do not know.
Therefore, many scientists have faith.