I have two different opinions about this.
The first one is that evolution should be taught, because there is the scientific proof behind it, and that creationism should not be taught, or not as much, because of a little thing we like to call separation of church and state.
However, as a Christian, I do believe in some aspects of creationism. When I was younger, we actually had a lecture at our Confirmation class and it showed that evolution and creationism CAN go hand-in-hand...it's a really long story but it really helped shape my beliefs, so in a way I do believe in both evolution and creationism. However the notion of creationism is offensive to many, but I feel that people who do believe it should have the opportunities to seek out the opinions and materials on it.
But nowhere do I believe that it should just be creationism.