I sincerely hope you won't turn your back on God simply because some people are confused about Him (or about themselves). You don't refuse to believe in the law just because you hear about a corrupt judge, nor should you refuse to believe in God just because you meet someone who is confused about Him.
Anyone can claim to be God, but you rightly put your finger on the real issue: What evidence is there to support their claim? The answer is clear: None. But Jesus Christ was different, and the reason is because He not only claimed to be God, but His whole life was a witness to its truth. Because of that, He alone could truthfully say, "I and the Father are one" (John 10:30).
What evidence is there for Jesus' divinity? The first is that of His sinless life–something only God could do. The Bible says Jesus was "tempted in every way, just as we are–yet was without sin" (Hebrews 4:15). Then there is the evidence of His miracles–miracles that demonstrated the power of God.
But the final proof of Jesus' divine nature was His resurrection from the dead. Anyone could claim to be the Son of God, but only Christ proved it by coming back from the grave–an event witnessed by hundreds. Who was Jesus Christ? He was God in human flesh–and He came into this world for one reason: to save us from our sins. Why not open your heart to Him today?