For all of you visual-spacial learners, here is a website that may be of interest to check out briefly, particularly the cartoon on this page: http://www.theophilus.org/powers1/temples.html. As for the debate, since other people have quoted Scripture, I will assume I am allowed to, right? 
Jesus is God
In the book of Romans, Paul (the apostle) says that "all have sinned and fall short of the glory of God". God has never sinned, nor will he ever because he is perfect. Perfect beings do not sin. Jesus did not sin. Therefore, Jesus is not one of us and he is God.
Also, in John 1, it says that "In the beginning, there was the Word and the Word was with God and the Word was God... and the Word became flesh and dwelt among us". The Word is clearly Jesus Christ, and it says he was with God in the beginning of time and he was God.
When John the baptist baptized Jesus, all three parts of the trinity were present. Jesus was present in human form (a tangible object, in a sense), God spoke and said "This is my son and I am proud of him" (or something to that effect) and the Holy Spirit was present in the form of a dove, a recurring symbol in the Bible. (If you read the story of Noah and the Ark in Genesis, Noah sent out a dove which got the olive branch from the mountain.)
The Bible does not specifically say "trinity".
Nowhere in the Bible is there a record of the word "trinity", so this is why a lot of people disagree. There is another verse that specifically says something to the effect of there being three parts to God, but I'll have to find it.
A practical example to illustrate the trinity (and one that is used in many elementary religion classes). Imagine an apple, made up of the skin, the flesh and the core. There are three parts to this apple, but it is still one apple. There are three parts to God, but he is still one God. Another example commonly used is the shamrock.
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Itaque incipet.
All that glitters is not gold but at least it contains free electrons.