If you want to set up your site so that you have a home page that is outside your wordpress site (which is why I assume you have renamed the wordpress index.php file) the best way to set things up is to have wordpress installed in a sub directory off the root rather than in the root.
However, given you are already 'up the creek' so to speak there is another fix.
- Make a copy of your index.php file but place this before any of the content
Template Name: Home Page
Then save this page as homepage.php in your theme folder (/wp-content/themes/themename).
Now go into WordPress admin and create a new page, call it 'Home' or whatever you like and on the right hand side select 'Home Page' from the template drop down.
Go into the settings>reading menu in WordPress admin and change the option Front page displays option to 'A static page' and select the Home page you just created.
Finally go back and remove your old index.php file and rename the news.php file to index.php
Whammo you will now be serving up the old index page through your WordPress install, and when people hit index.php on your site they won;t see the standard WordPress home page.