I just installed a plugin that makes this site more mobile friendly. I took some screen shots from my cell phone to explain a few things. My phone is an iPhone4 so I am not sure how it will work on other phones.
When you browse to http://raptureintheairnow.com/ you should see the site without the header pictures and no sidebar images.
To login and/or register, tap the top blue title bar.
Tap the first Dashboard icon
Use this screen to login. If you still need to register, tap the Register link at the bottom.