That makes sense to me, but it still doesn’t address the issue of whether or not mortal sin is any different from venial sin, or whether penance is necessary as told to us through revelation.
You know, their right there is no difference between simply being angry and yelling and screaming at someone and actually killing in angry.

YEP, it’s all the same sin!

That is one of the major problems with this type of thing. They try soooo hard to deny the difference in sin that they make the theology they set up look ridiculous. If there is no difference in sin then everything should have the same punishment.
Their understanding of mortal and venial sin is also wrong.
Working definitions of mortal and venial sins could be: Mortal Sin is “sin causing spiritual death,” and Venial Sin is “sin that can be forgiven
Mortal sin CAN be forgiven while you are still alive, just as venial sin is forgiven. The proper definition is Mortal sin causes spiritual death while venial sin just makes the soul sick.
Colossians 2:13 and 14 confirm this fact, “When you were dead in your transgressions and the uncircumcision of your flesh, He [God] made you alive together with Him [Christ], having forgiven us all our transgressions, having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.”
What happened to people when they died before Christ’s death on the cross? HINT, they sure didn’t go to heaven! What happened after Christ’s death and resurrection? HINT, people started being allowed into heaven. That is what the Biblical passage is referring too.
God has “…forgiven us all our transgressions…”. Not just the sins of the past, but all of them. They have been nailed to the cross and taken out of the way.
So after Baptism I can do whatever I want with out having to worry about the pains of hell? This is OSAS!!!
When Jesus, on the cross, stated, “It is finished” (John 19:30), he was stating that he had fulfilled all that was necessary to grant forgiveness and eternal life to those who would believe in Him.
Actually the word “finished” according to the Strong’s Concordance has several different meanings.
Original Greek word is
teleo means:
to end, complete, execute, conclude, discharge
finish
fulfill
accomplish
pay
perform
expire
make an end
fill up
go over
Frequently this word signifies, not merely to terminate a thing but, but to carry out a thing to the full.
Christ was referring to the Passover. The sacrifice of the unblemished lamb had been completed and of course what do you do with the lamb after it’s been sacrificed?
Scott Hahn gives a really interesting talk on this. If you check out what an official
Jewish Passover looks like you’ll see that it backs all this up beautifully. Check out #14.
The Bible does teach by word (Galatians 6:7 and 8) and example (2 Samuel 11-20) that when a Christian gets involved in sin, he or she may reap temporal, physical, emotional, mental and/or spiritual consequences. But the believer never has to reacquire God’s forgiveness due to personal sin because God’s Word declares that God’s wrath toward the believer’s sin was satisfied completely at the cross.
Once again this is OSAS! If we do not need need to ask God for forgiveness than what in the world all those passages that talk about REPENT etc, doing in the Bible? Why did Christ tell the apostles when he breathed on them “whose sins you forgive are forgiven, whose sins you retain are retained”? Why does James say “confess your sins to one another”? I could list a number of other passages that deal with this!
Does the Bible teach that a person who is truly saved by God through Christ can lose his salvation and regain it? It clearly does not teach this
BINGO, Like I said OSAS! There an awful lot of ifs in the Bible. “If you love me”, “If you obey”, etc…
If one follows the concepts of mortal and venial sin, he or she may be deceived into viewing sin with a flippant attitude, thinking that he or she can sin at will and simply seek God’s forgiveness at a point of personal desire.
By the same token if one believes that they can never go to hell they can end up believing that they can do what ever they want since they are already saved.
As far as penance goes, when you break a window do you get off scott free? Of course not. Well you be forgiven for breaking the window? Yes, but you still need to do something to make satisfaction for breaking the window, i.e. either fix it or pay for a new one. That is penance.