Given the stark difference between evolution and six-day creation, many people assume that Darwin's theory shook the foundations of the Christian faith. In truth, the literal six-day interpretation of Genesis 1-2 was not the only perspective held by Christians prior to modern science. St. Augustine (354-430), John Calvin (1509-1564), John Wesley (1703-1791), and others supported the idea of Accommodation. In the Accommodation view, Genesis 1-2 was written in a simple allegorical fashion to make it easy for people of that time to understand. In fact, Augustine suggested that the 6 days of Genesis 1 describe a single day of creation. St. Thomas Aquinas (1225-1274) argued that God did not create things in their final state, but created them to have potential to develop as he intended. The views of these and other Christian leaders are consistent with God creating life by means of evolution.
The details can be found here.
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I do not seek to understand that I may believe, but I believe in order to understand. For this also I believe, –that unless I believed, I should not understand.-- St. Anselm of Canterbury (1033-1109)