I've added the lines w/my rbenv Ruby versions to my /etc/apache2/httpd.conf file
Well, that tells us nothing really, because we can't tell if what you put in was correct.
Passenger's configuration options include the ability to specify which Ruby to use. With Apache use:
PassengerRuby /usr/local/bin/ruby;
For Nginx use:
passenger_ruby /usr/local/bin/ruby;
In nginx.conf, or an included .conf file it'd go inside the http { ... }
block. I'm not sure what it'd be with Apache because I'm not using Apache with it.