You are basically saying "my religion is right, and all other religions are wrong". You have written an awful lot of words to say what can be said in a single sentence.
How can I know that I am right and others are wrong unless I am perfect? I think I am right about things based on my best judgment, the same as you or anyone else does when they think they are right.
It can always turn out that someone else knows something that you currently think you're right about. The question is how to arrive at a clear understanding that changes your POV without opening yourself up to lying and manipulation.
I don't accept your definition of sin. I don't accept your manner of getting sins forgiven. This doesn't really matter anyway because I don't have the same goal that you have. But let's talk about the more interesting issue.
You can't not accept my definition of sin because I have defined it in the vaguest possible way to allow room for any particular ideas about what does or doesn't constitute sin to differ. Ultimately, I don't believe that one person's sin is another person's virtue, except to the extent that subjectivity can sometimes make a sin seem not sinful or a virtue seem sinful.
What you have to agree on regarding sin is that it is a deviation from what is good/right. Regardless of what you consider good/right, you measure deviations from it as being worse than the ideal. That's fundamental. You wouldn't be able to do anything if you didn't distinguish between better and worse choices.
You used the word "destination"... I am going to change that to the word "goal". I don't care about the afterlife. I suspect that there is none... but even if there is, I am here on Earth and I am focused on living my life now. Any plans for the afterlife can wait.
You're just nitpicking in order to disagree now. You're avoiding accepting the validity of things I say that are valid.
My purpose is to live a full life here. I live for experiences; I value relationships (especially with family). I value seeing people around me enjoy themselves. I value travel and putting myself in new circumstances, I value advancing in my career and making a contribution. I value sex and poker and good Scotch.
I don't care about your perverse values. I've told you that. I don't need you to re-assert them for me to hear again.
My goal (or my "destination") is to live a full balanced life. I want to make the lives of the people who know me best better, I want to help my kids live full, quirky lives. I want to do interesting things, meet interesting and enjoy as much as I can.
How is this relevant to the thread? You're just preaching your own personal life values.
The afterlife, if it exists, is an extra. You and I have different perspective, partly because you and I have different "destinations". I am OK with that.
In Dante's Inferno, the top levels of hell are much like Earth and the suffering for sins are proportional to the sins themselves. It is not that different from philosophies of karma and reincarnation where one never really dies but just suffers death and rebirth over and over to go through the cycles of reaping what they have sown in the past.
If you don't mind the effects of risk and indulgence you say make life interesting and exciting for you, maybe you are just a pagan/satanist who doesn't want to go to heaven because you would consider it boring and you don't mind the various forms of emotional suffering and torment that come with sexual entanglements.
Probably the problem you have with what I'm saying, though, is that you don't want to define your preference for sin and hell as such because it sounds negative and that hurts your pride. Instead, you want to use the language of goodness and virtue to describe your preference, and you want to reserve words like 'sin' and 'hell' for lifestyle choices that deviate from your ideals, such as celibacy and other risk-aversion.
Would you call celibacy and risk-aversion sinful because they sacrifice the opportunity to indulge in thrilling and pleasurable activities? In your beliefs, do you see God as a pleasure-dealer and the devil as the one who would tempt you into foregoing pleasures?
Or could you accept my analysis, that hedonism is falling to temptations of the world and hell as the eternal perpetuation of indulgence and its effects in the hereafter?