It's surprisingly easy to debunk Christianity.
All you need to do is to prove that Jesus didn't die on cross and the entire religion falls apart. At the core of it is the story of God sending himself to kill himself in order to pay to himself the debt humanity owes to him for breaking his law. So, how can we prove that Jesus didn't die on cross?
Easy.
First I'll remind you of what you know then tell you what you don't know and the reason for you not knowing it. The thing you know is that Pilate asked the crowd who should he free - Jesus or Barabbas. What you probably don't know, and there's a reason for it, is that Barabbas name was Jesus, too.
Why do you don't know that and why that name was being suppressed by church when that story is being told?
Let's see what Barabbas actually means:
Pilates asked the crowd:
"Should I free Jesus, Son of the Father (Jesus Barabbas) or Jesus that claims to be the king of Jews (Messiah)?"
The picture getting clearer now?
Pilate freed Jesus, the Son of God!
The wrong Jesus got crucified, the one on whose death and resurrection the entire Christian religion based its validity walked away.
So, what went down?
A successful mission in which the Jesus' friends rescued him from a certain death. Who do you think was in that crowd asking for his release? His friends, of course!
There's just one of his close friends that wasn't on it (apostle Thomas) and him making noise and asking question in public had to be explained away and today we remember him as a doubting Thomas.
What about the empty tomb? Doesn't that prove his resurrection?
What do you think? What really happened - a man raised from the dead (a zombie!) or the Jesus' friends taking the body of the wrong Jesus and burying it in secret so that their plan doesn't get exposed?
The story of resurrection was invented as a coverup story that should explain the empty tomb, but also provide some street cred for the cult of Jesus and enable his crew to continue to run the show after Jesus went into hiding.
So what happened to Jesus after the rescue?
His days of preaching and running the cult were over. He first moved to Emmaus, but (as reported by Luke) after being spotted by some of his followers that weren't included in the above mentioned operation, he decided to go to Galilee and make a living there working as a carpenter.
He setup a shop but soon fell on hard times which resulted in him being sold to slavery for his debts. A salt mine bought him where he worked for a couple of years, getting into many fistfights and causing trouble.
That was noticed by a local Roman that ran the gladiator school and he bought him from the salt mine. Jesus had a short, but successful career as a gladiator. He died while taking part in a revolt against the Romans, four years after his first fight as a gladiator.
In Conclusion
The real story of Jesus doesn't look that grandiose when you compare it to the story that's being told by the Christians, but I find it fascinating. It is a story of true friendship, rise and fall, good times and bad times. A truly human story worth remembering and retelling.
PS - Expect the Christian gainsayers trying to suppress and deb00nk this story