Sin is "subjective". It depends on both your religious persuasion and your perspective. Even then, though, it's highly unlikely that anyone can remember everything they do or fail to do.
Because every human Is constantly tempted to commit sins. Because Christians, and everyone else for that matter, is aware of the fact that human beings are tempted to commit sin. Part of being a human is a desire to satisfy ourselves in ways that are not correct.
I think the ultimate sin that we as Christians commit is Worry.
Yes, he forgives you for every thing
No, if you are a Christian, you believe God will forgive you of every sin you commit if you are willing to repent, confess your sin, and forsake the sin you committed. Allah has no part in the Christian religion.
No, it is believed that in heaven, there is no sin or wrongdoing.
thou shalt not sin. it is a sin to commit murder.
I am unclear as to what the "reality of sin" is. Sin itself is a very real thing in almost every religion. The real questions what are: what forms does the sin take, what categories of sins are there, how do you commit sin, how do you repent from sin, what are the physical/social/psychological effects of sinning, etc.
Greed
not sure but it is a sin to commit suicide in Islam as is in Christianity.It's a sin in Islam to commit suicide
Saint Patrick did commit one sin. No one knows the sin he committed, but he committed the sin in his youth before going to Ireland.
Corporate sin is when a group of people get together and jointly and knowingly commit a sin.
When you are baptized every sin you have commited before that time you are free from. But if you are a baby you havent commited any sin because to commit a sin you must know it is wrong but still do it.