Getting Closer - Almost there
I solved one problem but not the main problem.
I was able to stop the email from coming from Authorize.net even though in the Authorize.net control panel I unchecked the box that says, "don't send email to customer."
I found in the confirm.php page there is a setting for x_email_customer
This was set to TRUE. I changed it to False and no more Authorize.net emails to the customer.
Now, I just need to figure out how to get an email after the order is complete.