Is it possible for millions or even billions of people to seek Jesus Christ, to believe on Him, and still be lost? That is exactly what is happening today. Why is everyone today believing a message that is exactly opposite of the message that Christ brought and taught?
The same crowd that had taken the loaves and the fishes form the miracle that Christ performed for them out of compassion, rejected Him and turned away from Him when He offered them a real spiritual food instead of just material possession.
A long time ago, humanity lost it's way, and now doesn't know the way to happiness, peace, and prosperity. Men have always rejected the message that God sent thru the prophets of the Old Testament and thru His son Jesus Christ. Although they believed on Christ, they deified Him, they excepted His name, but they rejected His message and they crucified Him, and they still reject His message today.
If you was asked for proof that Jesus was the Messiah, could you prove it? What would you give for absolute proof? How could you prove that the Jesus of Nazareth was the Messiah? The Jews of His time would not except that he was the Messiah. And they asked Him for proof, and Christ himself gave them evidence that He was the prophesied Messiah to come, what was it?
Suppose Jesus Christ walked into your church looking just like any common man, and you heard Him teach thing that were exactly contrary to the teaching that your church has always taught, would you believe Him or your church? Would you except Him? Would you believe Him? How would you even know if He were the Messiah?