All sin is mortal in that it puts us under the death sentence that i my. brief can remove. Once He has removed your sin He removes all sin - there is. i sin to small or great for His blood to wash clean
Yes, I know that now, since my spiritual eyes were opened. Of course, when I was a catholic, I was totally spiritually blind. I had no spiritual understanding at all. After I got saved, and got assurance of salvation, I looked back on my life, and marveled at the incredible spiritual blindness I had when I was a catholic.