Or perhaps you need to? John most certainly turned the "lost sheep" back to their God. That was his sole purpose in being born. You seem to want to paint him as a failure....?
John's purpose was to prepare the way of the LORD (Matthew 3:3) Yeshua sent his discipes to preach repent, the kingdom of heaven is at hand, to the lost sheep of Israel. John preached to Judah/Jews. Judah and the house of Israel/Ephraim, have yet to "acknowledge their guilt" (Hosea 5:15-6:2) and have the LORD "revive us". And they both remain under judgment (Hosea 5:11-14).
New American Standard Bible Matthew 3:3
For this is the one referred to by Isaiah the prophet when he said, "THE VOICE OF ONE CRYING IN THE WILDERNESS, 'MAKE READY THE WAY OF THE LORD, MAKE HIS PATHS STRAIGHT!'"