Seriously though, can we be forgiven for all of our sins?

Over rea.. The Holy Spirit as a holy agent to speak to us and soften our hearts and bring the story of the Crucifixion fresh to us. He is very gentle as a dove. If you blaspheme Him He may leave you. If He leaves you, you will be more hardened against your eternal salvation. If you repent and welcome Him, He will start again to lead you to the light.