The list goes on. By the way, I was raised a Roman Catholic and I also read the Bible.
You must not have read much of the Bible, because 1 John 5 16-17 specifically talks about sin that is "deadly" or "mortal" (the two words are equivalent) and sin that isn't. So I guess it's your tradition that directly contradicts the Bible, huh?
I have no tradition. I just believe the Word.
There is only one sin that leads to death- blaspheming the Holy Spirit by denying Jesus is Lord. Jesus said so Himself. In God's eyes there is no difference between sin- if you die without being saved you go to hell even if you have committed only one sin.
To God murder=adultery=stealing. What John is saying is that no sin leads to death unless you're not saved by the blood of Jesus.