When many before Christ spoke of his coming there seemed to be much doubt and confusion. When Christ did come, there was still doubt and confusion. After his death, it was even more challenging the doubt and confusion. It has taken over three thousand years after many a prophet. Many a preacher. And many books relating to God and his expectations and explaining the return of the Messiah. Even after all of these things have come to fruition. Doubt and confusion still exist. You have to trust and believe.
James 1:6 But let him ask in faith, with no doubting, for the one who doubts is like a wave of the sea that is driven and tossed by the wind.