It is really simple to become Christian, accept Jesus Christ as Lord of your life. God offers forgiveness and eternal life when we believe in or put our trust in Jesus and what God offers in him. Jesus himself said, "I tell you the truth, those who listen to my message and believe in God who sent me have eternal life.
They will never be condemned for their sins, but they have already passed from death into life." (John 5:24 ) Putting our trust in God and receiving Jesus into our heart is a declaration that we are in need and in trouble without God's saving power. The need comes from our sin and the guilt that we can't escape on our own.
The need comes from our spiritual loneliness and an emptiness that only God can answer and fill. The need comes from a desire to be in a loving and meaningful relationship with the One who made us but from whom we are separated. We seek help.
We seek love. Putting our trust in God and receiving Jesus into our heart is agreeing that the benefits offered meet a need we can't meet anywhere else and satisfy our deepest longings that no one else is able to satisfy.