Macroevolution requires adding new genes with special capability. You can't get more of anything by removing some of it. In the 20th century we have learned many things about genetics, thermodynamics, probability, and information theory that weren't known when Darwin developed his theory. These new discoveries give abundant evidence that lower forms of life can't evolve into higher forms. In the 19th century, Darwin could be excused for thinking that what he saw on the Galapagos Islands could explain how life appeared on Earth.
Today there is no excuse.
1 A Biblical creationist is a special kind of creationist. A creationist is anyone who believes that life as we know it is the result of an unspecified intelligently guided process. A Biblical creationist is one who believes that the process that created life is the one described in the book of Genesis.