You got that wrong, you're looking at the Slider Settings: Above Masthead or Slider Settings: Below Masthead option right? That means you don't have any feature slider set on your homepage.
You can see if a plugin (Revolution Slider) is active or not on the Plugins panel, not on the page settings.
That is because you did not create or import any revolution slider on your site, I did go ahead and imported a demo slider and that did look good on your homepage.
That is because you enabled the One Page Navigation on your homepage.
Deactivate that, and your homepage will get your Primary Menu (your New Menu). You can see or configure your menus under Appearance > Menus.
That is not a background-color, that is a place-holder (temporary) image. Please change that to an actual image.
Please open/edit your homepage in Cornerstone, look for those Skill Bar elements, delete it and place a Google Map element on that column instead.
If the map did not show up, please get an Google Map API key from Google.
Creating your Google Maps API Key
You can insert the following code into your text/paragraphs.
<a href="YOUR SERVICES PAGE URL HERE">SOME TEXT LINK HERE</a>
Hope this shed some lights,