People are free to "think" whatever they want. That doesn't change the fact that there is evidence saying that they did.
I've yet to hear a good reason why an "intelligent designer" would place transitional evidence in the body of whales, salamanders, snakes and other creatures. Cruel sense of humor?
Some scientists think your "evidence" has (purposely?) been misinterpreted. If you want to believe whales used to walk the earth, that's your right. If I side with the scientists who disagree, that's my right. Students should hear both sides.