Not to pick on you, as creationists seldom keep up to date on creationism, let alone mainstream science, but this idea of entropy "beginning" with the fall of man has been all but universally abandoned after Henry Morris retired as President of ICR. Other creationists had tried to tell him how crazy it was for years, but he had the power and influence to overrule them and impose this notion as ICR orthodoxy.
But nobody, including Morris, ever explained how a universe without entropy would actually work. Consider (as just for one among many problems) that you couldn't have friction, which necessarily involves the transformation of kinetic energy into higher entropy heat energy. Muscle tissue wouldn't work and, even if it did, Adam couldn't walk anywhere anyway. Every surface would have been like infinitely slippery ice.
In short, if you could have a universe without entropy it would be a different universe from this one, which an entirely different physics. So, in essence, you are proposing a complete and wholesale re-creation of the entire universe, which the Bible clearly does not contemplate, when you talk about entropy "beginning" at the fall.