Bible tells that Jesus forgave sins before his death, and also disciples of Jesus had the right to forgive sins, without death. It is not my invention.
The scribes and the Pharisees began to reason, saying, "Who is this that speaks blasphemies? Who can forgive sins, but God alone?" But Jesus, perceiving their thoughts, answered them, "Why are you reasoning so in your hearts? Which is easier to say, 'Your sins are forgiven you;' or to say, 'Arise and walk?' But that you may know that the Son of Man has authority on earth to forgive sins" (he said to the paralyzed man), "I tell you, arise, and take up your cot, and go to your house." Immediately he rose up before them, and took up that which he was laying on, and departed to his house, glorifying God.
Luke 5:21-25
Whoever's sins you forgive, they are forgiven them. Whoever's sins you retain, they have been retained."
John 20:23
I believe what the Bible tells, but I understand if others don’t want to believe it.
I believe there is two reasons. First is this:
For to this end Christ died, rose, and lived again, that he might be Lord of both the dead and the living.
Romans 14:9
And second is:
Most assuredly I tell you, unless a grain of wheat falls into the earth and dies, it remains by itself alone. But if it dies, it bears much fruit.
John 12:24
The meaning of that is, by dying Jesus could be raised from death. And by raising from death it was shown to his disciples that death is not the end, which then gave them courage to continue and endure all suffering that was for them.