The renegade (from her Christian roots) novelist E George’s lover, Spencer, coined the expression ‘survival of the fittest’ as the modus operandi of nature. There was some anger that this was the case, especially in Darwin’ thinking, but it is the vanity to which nature has been subject since the revolt of mankind, Rom 8.
It was used by the 19th century intellectuals around the destructive Miss George to invent an end to Christian faith. It became the MO of ‘young Germany’ under Haeckl’s validation. They saw themselves as the purest form of nature at work in the world.
So there is substantial conflict between this core evolutionary doctrine and Christian faith. Even E Burke’s chapter on this in The Day The Universe Changed says as much.
