Respectfully....you need to get out of the catholic church if that is what they are teaching you. Multiple verses that don't suggest men have a tendency to sin. These verses confirm men sin....and that all have...except Christ.
But, let's examine some of these examples you cite as maybe not sinning.
Noah
The bible records Noah found favor in the eyes of the Lord. He was righteous and blameless in his time. However in Genesis 9:21 the Bible notes Noah got drunk. So Noah sinned.
John 1:29
...."Behold, the Lamb of God who takes away the sin of the world."
Sure sounds like John understood the world was full of sinners.
Mary
Luke 1:46-47
My soul exalts the Lord, and my spirit has rejoiced in God my Savior. For He has had regard for the humble state of His bondslave.
Mary understood she needed a Savior and that was going to be her Son....Jesus Christ.
Ever seen small kids? Ask any parent...they'll tell you the kiddies are sinners.
The Bible is clear on this...All have sinned and fallen short of the glory of God.
That is not a sin. Jesus got quite a few people drunk.
John understood the world was full of sinners
It is full of sinners. That is why John came and then Christ. No one argued otherwise.
Mary understood she needed a Savior
Mary indeed needed a Savior; ;this is Who prevented her from all sin.
kiddies are sinners
No. Sin is willful violation of a divine law understood by the sinner to exist. A young child, before about 7 years old, does not know the law and is not capable of free will.
you have to be kidding....If Noah, getting drunk was a sin, the Jesus, making a bunch of wine LATE IN THE WEDDING PARTY was intentionally leading people into sin.
John did, indeed, realize that the world was full of sin but that in no way implied that ALL the people in the world were sinners.
Kiddies???????not a chance that a just God would consider kiddie behavior sinful.
You never did mention the mentally deficient...a person aged 40 with the I.Q. of a 2 year old can sin????? Please, I'm certain that God considers them among the chosen, even if they have no idea or concept of who He is.