That is not going to be easy. I have tried the five minute explanation on several of my JW family. What I did that has helped at least 2 was to get a list of Bible verses that have been changed . I put the list of Scriptures and what they said on one side of the paper..on the other side the same scripture on how they should be. I also went ahead and told them that the gospel is simple and it doesn't take the watchtower to explain it to anyone. Believe in the Lord Jesus Christ, believe that He died for your sins, shed HIS blood and took your place. That He was buried and raised back to life and He. Your sins are forgiven if you believe in HIM. The JW's always quote that scripture about the wages of sins is death. But they always leave off the other part of the same scripture...The BUT the gift of God is ever lasting life to all who believe.(Romans 6:23) Nothing in the Bible says that you have to know if there is a hell or exactly who the 144,000 is, or any of the other doctrines to be saved. That is NOT a requirement. I also love the verse in Ephesians 2:8-9..For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast. It plants the seed..and God makes it grow.