How will I remove the welcome to your new drupal site message that appears in the front page where there is no 'promote to frontpage' content? You see I will be displaying all the contents of my site using my own custom views. But as it turns out the welcome message seems not to disappear.

you can create a page-front.tpl.php (a copy of page.tlp.php) file and comment the print $content

Alternatively there is a variable called $is_front that is true if you are on the front page and false otherwise. So you can replace print content with.

print $is_front ? $content : '' ;

And that is it