I’ve read it several times, for it has been given to me as a penance in Confession.
Why argue about little things?
Why argue about little things like Christ atonement for Sins? Are you kidding me Salvation?
Are you a Christian, believing Christ's atonement for your Sins is a little thing?
Again, Christ said "unless you believe that I am He you will die in your sins" - the one who paid for your sins, you will not go to heaven. And since God cannot admit anyone with sin into heaven (it would corrupt heaven) therefore you would end up in the other place, sharing with Satan and his demons in their punishment for all eternity.
It is the one unforgivable sin.
Do you really want to risk it?