No. There are several credible opinions other than a literal interpretation, though a literal interpretation isn't entirely out of the question. There could have been two historical people named Adam and Eve who sinned against God. No issues there. I lean toward Adam and Eve being representative of humanity rejecting God. When the Fall happened or who were the first to Fall is an interesting question if you're into such discussions. There can little doubt however to the reality of a Fall, the clear evidence is well documented throughout ancient and modern history. Salvation is not dependent on believing someone else sinned first, it begins with understanding that I am a sinner and will one day be held accountable for my sin.
It's not an unimportant question, the when or who of the Fall, it is more important that we understand we are indeed fallen, desperately in need of a Savior.