As you can see from the words of JESUS, your denial of the reality of mortal and venial sin contradicts what was taught by JESUS.
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What Does the Bible Have to Say?
Matt. 5:19:
Whoever then relaxes (breaks) one of the least of these commandments and teaches men so, shall be called least in the kingdom of heaven; but he who does them and teaches them shall be called great in the kingdom of heaven.
Our Lord here teaches that there are “least commandments” a person can break and even teach others to do so yet still remain “in the kingdom of heaven.” That is both a good definition of venial sin and perfectly in line with paragraph 1863 of the Catechism. Then, Jesus goes on to warn us in no uncertain terms that there are other sins that will take us to hell—if we do not repent, of course. For example, in Matt. 5: 22, Jesus says, “… whoever says ‘You fool!’ shall be liable to the hell of fire.” In verses 28-29, he says:
But I say to you that everyone who looks at a woman lustfully has already committed adultery with her in his heart. If your right eye causes you to sin, pluck it out and throw it away; it is better that you lose one of your members than that your whole body be thrown into hell.
Clearly Jesus teaches there are some sins that will separate us from God for all eternity and some that will not–mortal and venial sin.
http://www.catholic.com/blog/tim-staples/mortal-and-venial-sin
As you can see from the words of JESUS, your denial of the reality of mortal and venial sin contradicts what was taught by JESUS.
Anyone who is in the kingdom of heaven is by definition already forgiven and saved so his sins are gone God demands absolute perfection anything less is sin and leads to eternal damnation UNLESS that sin is covered by the blood of Christ. There is no “safe sin” God may indeed count some sins as worse than others but even the slightest leads to damnation it would be cold comfort sitting in hell to have the satisfaction of knowing your sin that sent you there wasn’t quite as bad as the other guys
ALL sin is disobeying God.
ALL sin kills.
ALL sin has the same remedy, the blood of Jesus.
One lie will send you to hell as much as a life of debauchery.
God’s standard for entrance into heaven is perfection, as God is perfect.
One sin wrecks that and damns a soul to hell. People can rationalize all they want about how bad they think they’re not, especially when they foolishly compare themselves to other humans.
But God sees the filthiness and corruption of the sinful heart, even if the outward actions can be controlled to a degree.