Just touching on some comments about Jesus' teachings and how they are similar to Islam, Buddhism etc. While it is true that Jesus explained how to live righteously, similarly to other faiths, his teachings differ from those of other religions.
Jesus' message, especially when understood within the context of the Old Testament, is that no human being is capable of living righteously enough to get to Heaven. Jesus died a horrible death in order to take on the punishment that humanity deserved, and whoever believes that Jesus did that for them, and rose from the dead into eternal life, will go to heaven (as Jesus paid the price for the entry ticket, as it were).
A Christian's entry into Heaven is therefore entirely down to what Jesus did, rather than anything the believer did (except believe). This means that Christianity is not based on us doing anything 'good' at all, but most Christians will say that their heart has changed since believing that Christ died for them. They will want to live for God as an outpouring of their love for Him, and not as a means to get to heaven.
Someone said that Paul's teachings were very gentile in nature, and I disagree. He was a very highly trained Jewish scholar and the links to the Old Testament are clear, particularly in the book of Hebrews.
Sorry if this is very jumbled but it's very early!