The short story: He accepted Christ, believed and followed Him. He was real, alive, and growing for God. Then various circumstances came into the picture (of which I shall not go into here), and he gradually got entangled in first humanism, then atheism, and later Islam, and others. Sad story . . .
Atheists claim there is no more evidence for the existence of God, the Creator and Judge of humanity, than for the reality of obviously fictional entities, such as Odin or unicorns. However, four types of evidence or reasoning may be viewed as supporting rational belief in God, although they do not prove He exists: the unique universe, theocentric human history, existential need and moral conscience.
Current scientific theory states that the universe began with a “bang”, when a marble of matter or a singularity of energy suddenly exploded, and that it will end with a “whimper” when the stars eventually fade to darkness. This unique universe theory is compatible or consistent with belief in a God who created the universe “ex nihilo”, who sustains it by His power, and who will judge its moral agents at the end of time.
Current knowledge of world history suggests that humanity descended from one genetic source and evolved into various cultures. Throughout history humanity has perceived deity to be the ground of meaning and morality. Theocentric history reached its apex or spiritual climax with the NT teaching that there is one almighty and all-loving God, who desires all humanity to live in harmony on earth and also in heaven, and who allows humanity to experience earthly existence including pain and disappointment (KOTH) for the purpose of teaching them their need for Him (cf. HB 12:10).
Current existential reality indicates that mortals need God in order to obtain immortality, that morality needs God for a universal imperative and ultimate justice, and that the NT offers the best hope that this “duo of desirables” (DOD) or heaven and justice/hell can be attained. Just as physical needs are satisfied by material realities, perhaps our metaphysical needs indicate the reality of supernatural solutions (the God of the DOD).
Moral conscience indicates and logically requires accountability to a moral authority, and the supreme Authority would be God. Paul wrote (in RM 1:32 & 2:15) that people “know God’s decree that those who do evil deserve death” and that their consciences “show that the requirements of the [God’s moral] law are written on their hearts.” Our feeble attempts at earthly justice may reflect or serve as evidence of God’s perfect justice. This view is similar to Platonic idealism (cf. 1CR 13:12, HB 8:5, 9:23 & 10:1). We may perceive perfect justice partially (1CR 13:9-12) using spiritual eyes/intuition/a sixth sense along with inference, logic, and even imagination. [Slashes indicate essentially equivalent terms.]
This evidence is not proof, but because this hope and belief are based on evidence and logic, it is rational rather than “blind”, and it is made even more intellectually reasonable or defensible by acknowledging ways God would be disproved, which include the following:
1. If atheists or anti-christians created eternal life, because the Bible teaches that eternal life is God’s gift only to believers in Him (JN 3:16).
2. If the body of Jesus of Nazareth were discovered in a tomb, because Paul stated that if Christ is not resurrected, then faith is useless (1CR 15:14).
3. If it were proven that moral free will (MFW) is an illusion, because the premise of biblical morality is that human souls are accountable (DT 30:19-20).
4. If human-like beings on another planet had no salvation history involving God and Christ, because the Bible teaches that God is Lord of all (PHP 2:9-11). (Caveat: If they are included in the Great Commission, their history would be like the OT.)
5. If God could prove His existence to people without abrogating free will (cf. 2CR 5:7), but apparently God performs miracles only as necessary to accomplish His plan of salvation.
6. If it were proved that the universe is not created, because resurrection or re-creation presupposes creation and thus a Creator (ACTS 17:24-31).
But atheism has not proven these. Thus, both theism and atheism are unproven opinions or opposite subjective conclusions requiring faith concerning ultimate reality. However, the NT teaches there will come a time—at the resurrection or eschaton—when the proof atheists demand will be provided, and KOTH will end. At that time theism will be revealed as the right or true ideology as souls reap the opposite destinies of heaven and hell in accordance with their moral choices, beginning with their decision whether to love or to disregard God (cf. MT 7:24-27) .