"Evolution and the Bible most seriously conflict at this point (their respective views of death, which are central to each viewpoint). If evolution (or even just the concept of an old earth, with death and fossils predating man's sin) is correct, then death is natural, death is normal, death produced man. Most importantly, in this view, death is not the penalty for sin, for it preceded man and his sin. But if death is not the penalty for sin, then the death of Jesus Christ did not pay that penalty, nor did His resurrection from the dead provide eternal life.
While belief in creation and the young earth may not be essential for salvation (many Christians wrongly believe and do many things the Bible teaches against), if evolution is right, if the earth is old, if fossils date from before man's sin, then Christianity is wrong! These ideas destroy the foundation for the Gospel and negate the work of Christ on the cross. Evolution and salvation are mutually exclusive concepts.
Many times evolutionists understand this issue better than Christians. In his article, "The Meaning of Evolution," atheist G. Richard Bozarth claims that "Christianity has fought, still fights and will fight science to the desperate end over evolution, for evolution destroys utterly and finally the very reason Jesus' earthly life was supposedly made necessary. Destroy Adam and Eve and the original sin, and in the rubble you will find the sorry remains of the son of God. Take away the meaning of his death. If Jesus was not the redeemer who died for our sins, and this is what evolution means, then Christianity is nothing" (American Atheist, September 20, 1979, p. 30).
Thus the issues of death and time reveal the utter incompatibility of evolution, in any form, with Christianity."
From: "Evolution and the Wages of Sin" on the ICR website