Start by pointing out that the mechanics of creation are not the point of the Bible. We can disagree on aspects of creation and still be Christians.
That being said, the Bible is clear on some aspects and the theory of evolution greatly over reaches. Follow this response when arguing for God when talking to an evolutionist.
How to Respond
Point out that our understanding of amino acids and enzymes have advanced far beyond what Darwin ever understood. Species and animals do change over time, but this does not create a new species as evolution suggests. It is also statistically impossible for life to evolve from random molecules. Neither of these processes have ever been observed by scientists either in real-time experiments or in historical evidence.