The story is known too well already. So I'm not going to waste any time on it here. There are only two things that you need to know.
1. God killed his own son.
He ... spared not his own Son, but delivered him up for us all. Romans 8:322. He had the whole thing planned from the very beginning.
Ye were not redeemed with corruptible things ... But with the precious blood of Christ, as of a lamb without blemish and without spot: Who verily was foreordained before the foundation of the world. 1 Peter 1:18-20It's hard to imagine something worse than a father planning to kill his own son. Except maybe a father killing his son in order to keep himself from torturing billions of others forever.
"He that spared not his own son" shouldn't be trusted by anyone.