I know of no "faith-driven" claims of "evolutionists." The claims are based on evidence, not faith.
Perhaps you can specify some of the "faith-driven" claims?
Were I to convert to the evolutionist faith, likely I would rely for philosophical/spiritual backing in part on Richard Lewontin’s expression of faith in naturalistic materialism, as stated in “The New York Review,” January 1997, to wit: “We take the side of science (i.e. naturalistic materialism, my interpretation) in spite of the patent absurdity of some of its constructs . . . in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior . . . commitment to materialism.
“It is not that the methods and institutions of science somehow compel us to accept a material explanation of the phenomenal world, but . . . that we are forced by our a priori adherence to material causes to . . . produce material explanations, no matter how counter-inituitive, no matter how mystifying to the uninitiated. Moreover, that materialism is an absolute, for we cannot allow a divine foot in the door.”
Thus, a faith driven belief system, every bit as much so as is my own faith in a Creating, Sustaining, Judging, Forgiving, Redeeming and Saving God.