Easy Program, Use Google Doc to create Google Slides

I'm a pastor and teacher who prepares my sermons/messages/lessons in google docs. I use a video screen for my notes. I need a simple program that will automatically create google slides with my complete manuscript from google docs with the click of a button (or a few clicks). I need it to maintain the basic formatting (bold, italics, underline). I would like the generated slides presentation to be in 4:3 format, black background with white text. Would be great if I can quickly change the sizing of text on slides.