Well, the vast majority of science is theory. the validity and utility of a theory is taken on faith.
We engage in science because we have faith that the results will add meaning to the existence of mankind.
However, i think the "creationists" may be refferring to those scientists (usually camp followers) who use the science to attack the religious faith of others, and who claim to live by the supremacy of science.
Such men do use science as their own religious faith. I know one professor in particular. She/he believes science is sufficient and that those who know of higher things are idiots. but he/she is so insecure in her own religion of science that she must endeavour to atack Christianity at every possible turn.
Very similar to creationists who are so insecure in their faith that they spend time attacking science. Building creationist museums with fanciful displays of humans living with dinosaurs, and writing books on "intelligent design" that purport to be religion neutral, but are obvious attempts to insert faith into the realm of science.
Once an unknown thing can be explained as "the creator did it", then the very motivation for scientific inquiry is dead.