It is unknown what Jesus believed about the Old Testament. All his statements in the bible were selected by Paul, who probably indeed believed that Adam and Eve really existed and God really killed all those people.

However today the bible is usually interpreted in its historical context. Omitting this context causes some more or less ridiculous misinterpretations. From an atheist's viewpoint of course, it's a good thing when people who call themselves Christians worship a killer God and reject science when it contradicts the bible. This contributes to opening people's eyes about the nature of religion, and is probably a cause of the current receding of Christian faith in the US.

The discussion went far away from the original topic evolution, but I think this topic was already exhaustively treated in the "Science and Creation" thread on this forum.