The difference between theory and faith is far-reaching. Theory is someone's best guess based on unconfirmed evidence. Faith is confirmed by what God has made.
When Adam took Lucifer's word over God's, Lucifer became the master of this world, and that is why the Earth is corrupt.
“Teach a child to choose the right path, and when he is older, he will remain upon it.” (Prov.22:6)
There are many testaments of life after death, they are referred to as near-death experiences.
