Good Friday?

WARNING- This is not meant to offend my Christian brothers and sisters but just open up a discussion.

Why is Good Friday good? I understand that the Christian faith believes that Jesus death was a way to cleanse the world of all it’s sins but it’s still a death.  My  Jewish faith on the other hand mourns all deaths even those of a martyr so it’s hard for me to balance this question.  It’s also more tragic a death when it’s someone you truly feel plays an important role in your life. Maybe the holiday should be changed to Bipolar Friday for your sad that Jesus died but you’re happy that it wipes away your sins. Just a thought from a friend of the Jewish Faith. Either way may my Christian Brothers and Sisters have a truly Good Friday with much happiness, health, inspiration and love.