It might be claimed that unless a person believes and can prove Confucius, or the Muslim's Koran, or the biblical word of God, one might rightfully remain an non-believer.
Well, a "non-believer" really ought not believe in any religion, or any of the more recent scientific concepts, or anything else outside the contents of one's own mind. What might be the contents of one's mind? One visit to a typical nursing home can reveal what that amounts to evolving to a mind that can't do anything but shout out years, shouting "1965, 1966, 1967, 1968.....1994", then back down with 1973, 1972, down to 1965, and over again 24/7. I have one veteran dealing with that now. It takes a lot of research to plow through military events to identify the source problem!
The Bible doesn't require self-proof. The word of God is simply, and dynamically, the word of almighty God. So it is that I pray that one vet receive His mercy, that I exchange my present and eternal benefits for his credit, that he die in peace in His arms. I believe almighty God will fairly judge that.
Let the abundant mercies of the word of God mediate, like a public defender attorney, apply every benefit afforded by man and God towards all accused.
Do not judge, or rather if you must Judge, judge righteously, nor face your own judgment according to the LAW. Be merciful.