The active camera is the top camera in your comp and the only camera that will render in the AME or the render cue. In recent versions of AE you can save a RAM preview but only the active camera view will render. It has always been that way.
Thank you for your help. I saved the ram preview but the edges of the text which are associated with the cameras are pixelated. Is there any way to get around this or is that just a result of saving the ram preview?
Using a saved ram preview in production isn't a very good idea. Your ram preview was probably not at 100% Zoom Factor and full resolution. This is very poor technique. You need to learn to use AE correctly. DO NOT rely on saving Ram Previews. They are limited in length and you have very little control on the render.
I am guessing that you wanted to render one of the custom views. These are orthographic views and have a different look than the perspective views you get with a camera. If you need to simulate a custom view then create a camera with an extremely long focal length and use the unified camera tool to move it into position.