Aren't you Christian as long as you believe Jesus Christ is the son of God and was resurrected?
I would say that someone who believes that Jesus of Nazareth:
atoned or saved us from our sins
resurrected from the dead
has a relationship to God that is different from the rest of humanity
is a Christian.
Many Christians believe that resurrection is merely a metaphor for various things, such as everlasting life, or that it was made up by the writers of the gospels to fit the story (in a well intentioned way, as a tool to help the less educated understand the greatness of Jesus).
I think having a difference in theology is OK, as long as it is based on the Bible.
Many Christians do not take the Bible as all true, particularly the Old Testament, so having beliefs based on these sections that are not regarded as correct is the same as having beliefs based on non-biblical accounts.
Someone who beliefs in both the Old and the New Testaments, their prophets, the trinity and a requirement to accept Jesus Christ as the savior and redeemer of the world. Those are the basics and from there all bets are off.
The Old Testament was passed down through generations as an oral tradition, and therefore I find it very hard to believe that it is the word of God, especially when a lot of it blatantly contradicts the New Testament (not the other way around, as the New Testament was compiled in a much shorter time frame). Personally, the Old Testament hasn't been used at my church for years. Hence I don't think that it is necessary to believe it to be a Christian.
The Christian bible is a collection of texts that were at some point chosen to fit a specific doctrine.
Exactly. For instance, many 'non-canonical gospels' existed that aren't part of the Bible.
You have to draw the line somewhere and I'm drawing it around the Bible, writings of people who actually knew Jesus, until some other book exists that wasn't literally drawn out of a hat and has evidence of authenticity.
No-one who wrote the Old Testament knew Jesus.
There is debate over whether the apostle, Matthew, wrote the Gospel of Matthew, or whether it was just a collection of stories passed down orally to an author in the late first century AD. Luke the Evangelist, widely accepted as the writer of the Gospel of Luke, never met Jesus, and was an apostle of Paul. Paul himself never met Jesus, but has seven books in the New Testament. Also, as mentioned above, some other gospels not included existed. For instance, the Gospel of Thomas, written by Thomas, one of Jesus' twelve apostles. As you can see, the New Testament is not a collection of works by those who knew Jesus, and does not include works that may be more fitting of your description.