Karl Barth (10 May 1886 – 10 December 1968) was one of the principal Reformed Protestant theologians of the 20th century and the chief exponent of dialectical theology. He had a determining influence on how the relationship between faith and reason is conceived. Barth reinforced the Lutheran view of reason’s total incapacity to reach a natural understanding of God, rejecting every analogia entis (analogy of being) in discussing God, as well as the inadequacy of every religious experience to contribute to faith in Christ. However, he had the great merit of emphasizing a radical theological Christocentrism, bridging the gap with the theology of the Fathers of Church.
In 1965, his niece asked him on the compatibility of creation and evolution, and he wrote to her:
“The creation story deals only with the becoming of all things, and therefore with the revelation of God, which is inaccessible to science as such. The theory of evolution deals with what has become, as it appears to human observation and research and as it invites human interpretation. Thus one’s attitude to the creation story and the theory of evolution can take the form of an either/or only if one shuts oneself off completely from faith in God’s revelation or from the mind (or opportunity) for scientific understanding.”
Sources:
Inters.org
Wyatt Houtz, Karl Barth says Yes to Creation and Evolution
Science meets Faith 