Dear FearGod,
The stories that another one was crucified instead of Jesus, are all man-made.
God, has forbidden in Quran, that no one should add anything to His Book, and says, that is from God.
Although, that subject is not directly related to the thread, but I will give you the essential meaning and purpose of the things Christ had said on the Cross from Baha'i Scriptures:
"Remind them of these words and say unto them: ‘Verily did the Pharisees rise up against Messiah, despite the bright beauty of His face and all His comeliness, and they cried out that He was not Messiah [Masíh] but a monster [Masíkh], because He had claimed to be Almighty God, the sovereign Lord of all, and told them, ‘I am God’s Son, and verily in the inmost being of His only Son, His mighty Ward, clearly revealed with all His attributes, all His perfections, standeth the Father.’
This, they said, was open blasphemy and slander against the Lord according to the clear and irrefutable texts of the Old Testament. Therefore they passed the sentence upon Him, decreeing that His blood be shed, and they hanged Him on the cross, where He cried out,
‘O My beloved Lord, how long wilt Thou abandon Me to them? Lift Me up unto Thee, shelter Me close to Thee, make Me a dwelling by Thy throne of glory. Verily art Thou the Answerer of prayers, and Thou art the Clement, the Merciful. O My Lord! Verily this world with all its vastness can no longer contain Me, and I love this cross, out of love for Thy beauty, and yearning for Thy realm on high, and because of this fire, fanned by the gusts of Thy holiness, aflame within My heart. Help me, O Lord, to ascend unto Thee, sustain Me that I may reach unto Thy sacred Threshold, O My loving Lord! Verily Thou art the Merciful, the Possessor of great bounty! Verily Thou art the Generous! Verily Thou art the Compassionate! Verily Thou art the All-Knowing! There is none other God save Thee, the Mighty, the Powerful!’"
Selections From the Writings of Abdulbaha