C.S. Lewis gave a series of talks over the BBC at the height of WW2. Those talks were then compiled into a book called Mere Christianity. Lewis was adamant that this book was not meant to divide people but to present the fundamental principles of Christianity, hence the name Mere Christianity.

I am trying here to prevent anyone from saying the really foolish thing that people often say about Him: ‘I’m ready to accept Jesus as a great moral teacher, but I don’t accept his claim to be God.’ That is the one thing we must not say. A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic– on a level with the man who says he is a poached egg– or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God: or else a madman or something worse. You can shut him up for a fool, you can spit at Him and kill Him as a demon; or you can fall at His feet and call Him Lord and God. But let us not come up with any patronizing nonsense about His being a great human teacher. He has not left that open to us. He did not intend to.”

The central Christian belief is that Christ's death has put us right with God and given us a fresh start.

Christianity is the person of Jesus, his claims, suffering, death and resurrection, not the theories.

Christ was killed for us, His death has washed away our sins, and that by dying He disabled death itself. That is the formula. That is Christianity. That is what has to be believed.

you need to make a decision that won’t allow you to turn back…

So... we have to go through with it

So... we need God's help doing something he has no experience with...

So, God becomes a man!

He might be a LIAR....

He might be a LUNATIC....

He might be the LORD....