I agree with you that the day of the Lord’s death on the Cross was Thursday. My question is, why do we call Friday, “Good Friday?” Even if the day of death was Friday, why would it be called good?
According to my research, there are two possible origins for the term Good Friday. It could have either come from Holy Friday or from God’s Friday. In the Germanic language, where the term apparently originated, the word for good also means holy and is very similar to the word for God. In either case, it’s obviously a man made term, and cannot be found in the Bible.
Irrespective of the day on which it happened, what was “good” about the Lord’s death is that it was the culmination of God’s plan to redeem His people from our death sentence and bring us to eternal life.
But when this priest had offered for all time one sacrifice for sins, he sat down at the right hand of God, and since that time he waits for his enemies to be made his footstool. For by one sacrifice he has made perfect forever those who are being made holy (Hebrews 10:12-14).