Do you believe that the diversity of life on earth is the outcome of a blind purposeless process? That is what evolution teaches.
But we see exquisite features of design all around us in nature. They are not an illusion! To believe in a world without purpose is *self* delusion.
A far better explanation is that the Lord Jesus Christ created each kind of organism with inherent capabilities to diversify, so that they could fill the earth, and give glory to their Creator.
(Randy J. Guliuzza, P.E., M.D, Acts & Facts, December 2010, Institute for Creation Research)