My standard copy and paste of older posts of mine when this topic comes up:
Fact 1: Evolution is observable in nature. Natural selection is part of evolution, as is mutation, and genetic drift- these things exist. One example that proves evolution to you and even fits within a 24-hour timeline: Bacterial evolution, in every sense of the word, occurs very rapidly.
Fact 2: Our scriptures do not touch on the how of creation, because that wasn't the point of them. It's silly to read science into something that was never meant to convey such things. The purpose of the scriptures is to reveal God's purpose for man via the person of Christ. Evolution, the age of the earth, etcetera- or a vehement denial of the lack thereof- simply isn't found in the scriptures AT ALL. The only thing the scriptures tell us is that God is responsible for creation. The Old Testament points to Christ with types and anti-types of Christ. The scriptures aren't scientific documents, and I honestly don't see how science can be applied to them. Genesis is based on oral tradition and has a completely different focus than what science would even be looking at.
That people expend so much energy trying to make this a salvation issue- when all Christians involved believed that creation wouldn't be possible without God is petty and missing the forest for the trees. The only issue on this matter that a theist should have with an atheist is that of abiogenesis- but that is directly related to one camp not believing in God- and is the only issue of any import.