Trying to create a custom column for a custom post type

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You’re missing a couple of things

  1. hook for registering custom column is manage_edit-{$post_type}_columns thus you have to use manage_edit-Featured_columns on line one (instead of yours manage_Featured_columns ).
  2. hook for getting custom column content is manage_{$post_type}_posts_custom_column thus you should use this code in second add_action call: manage_Featured_posts_custom_column
  3. You have to add define columns which are about to appear in edit_Featured_columns function (first add_action call).

This way:

function edit_Featured_columns( $columns ) {
        return array(
            'cb' => '<input type="checkbox" />',
            'title' => __( 'Title' ),
            'redirect_url' => __( 'Redirect url' ),
            'date' => __( 'Date' )
        );
    }

That’s all. Your custom_Featured_columns function seems to be ok.

Here’s a good tutorial on this topic: http://justintadlock.com/archives/2011/06/27/custom-columns-for-custom-post-types