And now we come once again to trinity doctrine which states that God is one, and that God is three persons. That the Father, the Son, and the Holy Spirit are one God. This plurity is evidenced throughout the Bible and is fully understood in the New Testament. Let me explain, in Romans we are told to look to understand God in His creation, first you must understand that WE as the images of God are triune beings like God...
1 Thessalonians 5:23 "And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ."
Hebrews 4:12 "For the word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart."
When God created the universe, man was created in His image, this was probably not meant to mean a physical image. Instead consider for a second that God is indeed a Triune being, we therefore, being the images of God, are also triune. As the passages above show(If you believe the bible is the infallible word of God), we are indeed triune being body, soul and spirit. After the fall of man the bible makes it clear that every human owed a physical death for our sins, and our lifespan decreased from 1000 to the limit of about 120 years. For many thousands of years God told the Isrealites to sacrifice animals to make clean themselves of their sins. In Isaiah we find however that not even a human's death can make up for any of our sins, we find throughout the old testament instead verses that state the sacrifices were only symbolic. That an Elect One, a Lamb of God had been prepared to die for our sins(Google messianic prophecies), and would make clean anyone who believed in Him, before Him and after. Continuing on the idea that God is a triune God(see first post), we can use reasoning to say that if the Father is a spirit-physical being with an image(throughout Ezekial and Isaiah),the Son is the physical expression of God(First couple of chapters of John), the Holy Spirit is completely without image, and that the body is the physical expression of man, that the soul is a spirit-physical being with an image(Revelation), and that the human spirit is without image, than we can conclude that the body is the image of the Son.I don't know if any of that made sense, however the point is that there are parallels between the trinity of man and the trinity of God, and that Jesus Christ is the body of God. If this is so, then when Jesus died on the cross, the Body of God died on the cross, therefore God died in the same way that we have to(physically not spiritually), he was the ultimate sacrifice and he carried all of our sins with him to Hell (or somewhere else, there is much debate) for three days before he was resurrected. If there is only one God as the bible proved in my first post, and it is impossible for humans to be made clean by anything less then God, then the the bible clearly states that the mormon way is not the way to salvation. Also in answer to Peepnklown's statement, God is triune and the biblical verses you pointed out only reinforce this. For one, just because God is trune does not neccasarily mean that all three persons are always together, indeed the Father (and at the second, Christ) spends His time in the temple of Heaven, while the Holy Spirit is on Earth. Also when Jesus is asked about when His second coming would come, he says that neither He nor the Holy Spirit knew, but only the Father. And yet again I point out that the Bible clearly states that there is only one God(see first post). Also, as for the banner of christianity, I absolutely agree that no one(except Jesus) is perfect or for that matter even good at being Christian, but this only reinforces the need for understanding the bible, especially the parts about salvation, so we can make ourselves clean again from our nack at being bad at christianity.