Q. 1. Is there anywhere in the Holy Bible where it states that there are different kinds of sins, such as venial or mortal (grave) sins?
A. 1. That is an interesting question because many of the Protestants reject the Catholic teaching of venial and mortal sins. Yet such a teaching is found in the Holy Bible.
"If you see your brother committing what is not a mortal sin, you will ask, and God will give life to such a one—to those whose sin is not mortal. There is sin that is mortal; I do not say that you should pray about that. All wrongdoing is sin, but there is sin that is not mortal." [1 John 5:16-17]
Remember this biblical passage so you may correct those who say that a sin is a sin, no sin being greater than other sins. There are sins, if not confessed prior to death, will prevent the soul from entering the eternal Kingdom of God.