Or removing, say, Maccabees? Oh. Wait. How 'bout James? Is it a sin to think the Epistle of James doesn't belong in the Bible?
What do you have against James?
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Happy moments, PRAISE GOD.
Difficult moments, SEEK GOD.
Quiet moments, WORSHIP GOD.
Painful moments, TRUST GOD.
Every moment, THANK GOD.
To know to do good and not do it is a sin. (paraphased)
So to know you need to witness and you refuse then I would say yes it is a sin.
To say you don't believe the gospel is well......let me say I wouldn't want to be in that person shoes.
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Happy moments, PRAISE GOD.
Difficult moments, SEEK GOD.
Quiet moments, WORSHIP GOD.
Painful moments, TRUST GOD.
Every moment, THANK GOD.
Me? Well, I'm not a big fan of that promise of healing that doesn't always work. (Hardly ever does, seems to me.) Martin Luther didn't think it should be canon, either, if I remember right.
But really, I'm just askin'. There are some Christian groups that do have a different idea of what's in the canon, after all. Is it a sin to have it "wrong"?
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty