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Kenneth Heck
The above answers demonstrate the wealth of convincing proofs for those who have an open mind and willing to investigate the evidence.
However, man has free will; no proof, no matter how perfect, will convince someone determined to wilfully disbelieve as a matter of free choice.This is easily demonstrated by those who accept the mark of the beast and thereby go to the lake of fire (Rev. 14: 9-11). So, there is no conclusive proof for God which both believers and non-believers must eventually fall in line with.
Even if Christ were to return to earth in the flesh, non-believers would reject him and invent some excuse such as he is in reality simply a hologram projected on the earth by aliens or a particular
government.Reprobate minds by definition reject the truth in favor of their own personal beliefs.