For those who are familiar with Christian beliefs, the mention of an unforgivable or unpardonable sin is cause for a reaction of fear. So, what is the unforgivable sin? Is it some terrible sin that is so bad that God can’t forgive it? God loves all of us. But unfortunately, we are all sinners. So, God, in His infinite love, sent His Son, Jesus, to give Himself up on the cross so that His perfect life of righteousness can open the way for complete forgiveness, restoration, and eternal life with Jesus.