When you receive the Holy Spirit and decide to change your life to fit God's ways and believe in God and what Jesus had done (you can be baptized but baptism is only a symbol of washing away your sins) and sincerely repent, then you become a true christian. (In my opinion)
Christian denominations believe in different things and in different ways of becoming a Christian. For example, some believe that a baby is in the covenant upon baby baptism. However, in the Bible, Jesus very clearly explains to Nicodemus that the only way to become a Christian (although, of course, this word would not have been used at that point) is to be born again. This story can be read about in John, chapter 3.
For a person to be a true Christian, his or her sins must be washed away. Jesus Himself said in John 3:3, "3 Jesus answered and said to him, “Most assuredly, I say to you, unless one is born again, he cannot see the kingdom of God." What does it take to be born again? Romans 6:1-14 tells us when we are born again. We are born again when we are baptized into Christ and united with His death, so that we can be united with Him in His resurrection. Anything short of this is not being born again, and thus not a Christian.
A Christian does not have to be born again in order to be considered a Christian. I think that as long as you believe in the teaching of the Bible and do your best to abide by what it says that you can consider yourself a Christian without all the other stuff.
Born Again Christians aren't better Christians than regular Christians, despite what they might believe. A person does not need to become a born again in order to be considered a real Christian. Each person that practices Christianity is a Christian and these individuals are doing plenty to solidify their devotion.
To be "born again" means that one has gone through a spiritual rebirth, renouncing sin and choosing to accept Christ. Catholics, for example, do that at every Mass. Different Christian religions have a variety of doctrines about what happens next, and what it means to be "born-again", so Episcopalians, Methodists and Catholics do not necessarily describe themselves as born-again in the same was Evangelical Christians do.
A Christian does not have to be born again to be considered a Christian. All that is necessary for someone to be considered a Christian is for them to accept Jesus Christ as their Lord and Savior. Although different sects of Christianity have different requirements for entry, the acceptance of Jesus is usually the minimum requirement.