It matters not what I believe. If YOU believe that God exists and created all things, then you have to give him credit for everything, including diseases, natural disasters, etc. You cannot reasonably say that he created the rainbow, but monkeys created AIDs. That just makes you sound silly.
Jimi, I gave you two examples. We'll ignore the one of man transferring diseases to different species, but go with the one where man created disease, i.e. some forms of Parvo. How is God responsible for that? Simply because I believe He created man and the material with which man created this Parvo, does that make God guilty in your eyes? If so, please explain your train of thought on that one.
Second, if you have a child, are you responsible for what he or she does? Are your parents responsible for your actions? With that theory, no one should ever be held responsible for any crime, since it was obviously the fault of one's great-great grandfather being wounded at Shiloh that caused the original familial dysfunction producing a mass murderer.
As for HAIDS coming from monkeys originally, the last I read, there has been no definitive proof of that, although it was at one time widely theorized. Even if true, there is still a species of AIDS related exclusively to these primates and most believe HAIDS was endemic in these areas of Africa for decades before its existence became known.