If we are perfectly suited to our current environment why do we get sick? Why do we have diseases?
Man made viruses, bacteria, ect aside; we are created perfectly to survive in our environments and to reproduce. That is not to say that we are invincible and can not die. oh but the belief in God takes care of that too, our souls are eternal and will not cease to exist. You will obviously dismiss this but you can not deny that everything has a beginning and an end, and we as a species are suited to follow this course of nature