Years ago I was asked to create an evangelism cheat sheet.  After a few years it became a book. I have used it for my personal witnessing for years.   Many of these are lists of scriptures that I use to prove different points.  You can see the lists in the menu to the right or below. Good Websites to go to understand what others believe:

• CARM.org 
• LivingWaters.com
• GotQuestions.org