Becoming a Christian is as simple as ABC.

A - Admit you're a sinner. "But if we confess our sin He is faithful and just to forgive our sin and to cleanse us from all unrighteousness." (1 John 1:9) "For all have sinned and come short of the glory of God." (Romans 3:23)

B - Believe that Jesus is God and that He will forgive you.  The Bible teaches that "Christ died for our sins according to the Scriptures, that He was buried, and that He was raised again on the third day according to the Scriptures." (1 Corinthians 15: 3-4)   "If we confess with our mouth that Jesus is Lord and believe in our hearts that God raised Him from the dead, we will be saved." (Romans 10:9)