Being a Christian is an individual thing -- a personal relationship with Jesus Christ. He is alive, and wants to know and be known by you. No "religion" can save you, nor can any denomination or church. Only Jesus has the power to save you and give you eternal life.
In the book of Romans, the apostle Paul writes "That if you confess with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved."
We see here three clear ideas:
1- A public confession
2- Jesus is Lord
3- Believe God raised him from the dead
As recorded in the Bible, listen to what happened when the disciple Thomas encountered Jesus after he had been killed and was risen from the dead. Remember, that Thomas wasn't present the first time Jesus came to visit his disciples after his resurrection, and Thomas did not believe that he was alive based on the testimony of the others:
"A week later his disciples were in the house again, and Thomas was with them. Though the doors were locked, Jesus came and stood among them and said, "Peace be with you!" Then he said to Thomas, "Put your finger here; see my hands. Reach out your hand and put it into my side. Stop doubting and believe."
Thomas said to him, "My Lord and my God!"
Then Jesus told him, "Because you have seen me, you have believed; blessed are those who have not seen and yet have believed." Jesus did many other miraculous signs in the presence of his disciples, which are not recorded in this book. But these are written that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name."
The points are the same:
1- Jesus is physically alive. His body is resurrected. He is alive today, guiding his disciples just as he has always done.
2- Jesus is Thomas' "Lord." We don't use that word very much anymore, but it might be translated as "boss" or "king" or "master." Jesus is the one who tells us what to do, and when to do it. Sort of like the Army. The sergeant tells you where to go, what to wear, when to do everything. Jesus is the "master sergeant" of our lives.
3- Jesus is God. This is part of making Jesus Lord. Thomas said it outright. "My Lord and my God." All the disciples said it. Jesus clearly claimed it. But it is the hardest teaching in the Bible. The Jews heard Jesus say it, and crucified him for it. Most unbelievers will only say that Jesus is a good man or just a prophet, which is the stumbling block which keeps them from salvation. Why? Because Jesus must be God to be a sacrifice for all creation. Unbelievers ultimately don't want to put aside their own egos and admit they are sinners, admit they are weak, admit that they are helpless and lost without Jesus. The power of life is "Christ in us."
4- Because Jesus is Lord and Jesus is God, he hears our prayers and will save you if you ask him. We believe this by faith. The Holy Spirit is a "seal" or sign of that faith, and he provides the wisdom and power we need for daily living.
Hear these words from John 10:25-30 in the Bible:
Jesus said, "The miracles I do in my Father's name speak for me, but you do not believe because you are not my sheep. My sheep listen to my voice; I know them, and they follow me. I give them eternal life, and they shall never perish; no one can snatch them out of my hand. My Father, who has given them to me, is greater than all; no one can snatch them out of my Father's hand. I and the Father are one."