There is one God, who created everything. This one God consists of three 'persons'**: The Father, the Word (Jesus) and the Holy Spirit. This God is absolutely perfect, completely without sin.
** In Roman times, actors wore masks on-stage. The Latin word persona that came to be used meant mask, not person. This one God manifests in three "ways", He is not "three people" or three deities.
God wants companions, but He wants them to accept Him freely, not by compulsion. The first man and woman He created, Adam and Eve, chose to sin. As a result of Adam's sin, every person is born with a spiritual infection: sin.
God hates sin. God punishes sin.
God loves each and every person He has ever created, regardless of how much they have sinned. But He also is just. His sense of justice cannot let sin simply go unpunished.
What did Jesus do for
Jesus created everything -- not the Father. (See John 1:1)
Jesus came to Earth as a human and took the punishment for all mankind's sins – for your sins. He let Himself be beaten, whipped and crucified.
Romans 5:8 But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.
Three days after He died, Jesus rose from the dead. Shortly
after, He ascended back into Heaven.
How can you benefit from what Jesus did?
John 3:16-18  For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.  For God did not send his Son into the world to condemn the world, but to save the world through him.  Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of God's one and only Son.
Let us be clear: After death, everyone
lives forever. The difference is that
eternal life is wonderful, but eternal condemnation, eternal
punishment is horrible.
Romans 10:9If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, YOU WILL BE SAVED.
Consider this analogy:
Harry commits an armed robbery, is caught, tried and convicted. He is sentenced to five years in prison and a $10,000 fine. Harry's brother tells the Judge "Judge, I'll pay the $10,000 fine if that's okay with you." The Judge says "Sure, that's okay," so Harry's brother pays the fine.
Next, Harry's brother says "Judge, I don't want to see my brother's life ruined. He made a stupid mistake. I'll serve the five years in prison, too." Harry is incredibly happy! Someone else will be paying the fine and serving the prison time!
But the Judge says "Sorry, it doesn't work that way! Anyone can pay your brother's fine, but we don't allow substitution when it comes to prison time. Harry committed the crime – Harry has to take this punishment."
The Father could have said the same thing! He could have said "Jesus, I appreciate the offer, but is going to have to take the punishment, not You! But because the Father is also merciful, kind, and compassionate, He gave us the gift of accepting Jesus' sacrifice for our benefit.
(c) 1999 Christian Chapel CME Church, Dallas, Texas USA