Hello God's Lost Lamb,
All of the answers to your questions are in my free ebook.
Gravity True For You But Not For Mehttp://www.god-evidence-truth.com
You can find it on my site in all of the formats for free. Kindle, Book Nook, on your computer, etc.. Audio too and a video linked ebook with maybe 100 supporting short videos.
The book is targeted at skeptics just like you are talking about.
We also offer it in print as an evangelism tool. It can be purchased on our site. Right now we are offering a Shipping Cost Only Special. Box of 80 is $15 total shipped to you. We want them out of the warehouse and on the street. It has had many great reviews from college campuses to prisons.
If the person is really wanting to know the truth it will help a lot. If it is a matter of the will like many people it would not matter if God showed up in their living room. They would find a way to explain it away.
I know your hearts struggle here. I experience it often. A good thing to remember is that we cannot save anyone, God saves. We plant seeds. We are also compared to the watchman on the wall in the Bible. The watchman warns the people. What they do with the warning is entirely up to them.
God Bless, Mike