I am always suspicious whenever I see the phrase "scientists believe..."  A scientist "may" as a man, believe in God without a scintilla of empirical evidence to prove his position but as a scientist, when he presents data, if he is honest he might say "evidence suggests..." or similar, after  he has presented his data and his collection/experimental methodology.  As eminent a scientist and mathematician as Einstein was,  even today long after his death, empirical evidence is just coming to light that "supports" his theories but the operative term is "supports".  Overwhelming evidence from a variety of disciplines support Darwin's theory of natural selection but it remains a  theory.  If a scientist believes something, it scares me.