Christ said "not one of you are righteous". He did not say "not one of you are righteous, besides my mom here, she is totally perfect"
Where did Jesus say verbetium that no one is righteous? He didn't say the second part, I don't believe, but "no not one" was technically St Paul, technically quoting poetry (Psalms). How does one draw an absolute truth from a poem/song? Poetry is more a collection of emotional responses to God, rather than absolute truth from God. I don't believe Paul meant it universally, all people, because his reference had a context.
Unless by Jesus saying such, you mean He is the Word and everything in Scripture is thus from Him as the divine Son of God. Which is fine, I won't go into that because that's not really the topic. That's another can of worms, but if you want to be technical about who said what, Jesus did not say this quote. I know He said "no one is good but God" but I believe those (righteous and good) are two different Greek words, and they have different contexts. It'd actually be interesting for me to make a sort of study from this.
I always have wondered where the idea that Mary was without sin like Christ was. It never made sense to me, if she was Im pretty sure God would have told us all about it.
Haven't you ever wondered why Jesus didn't write anything Himself? If humility, then why does He reveal His divinity at all? Haven't you ever wondered why He would intrust His message to be delivered by flawed human beings with limitations on memory and limitations in understanding, esp when a great deal of His ministry dealt with misunderstandings/misuse of God's word? And even schooling those who ultimately wrote about Him? Were the Gospel writers perfect, flawless in their understanding?
If Jesus never Himself felt inclined to write His own thoughts, which great saints of the past did such as King David, then why would you expect all this concerning denominational differences, such as Mary, to be spelled out? It isn't in there because it wasn't an issue at the time. The Trinity is not in there either, nor was it firmly established in the Church for like three centuries, but I seldom see Protestants who accuse Catholics of making up doctrines after the fact question this fundamental belief (that they DO share with Catholics).
There are many things Protestants believe and practice that looks NOTHING like the first century Church. The first century Church had actual dinner Coummions, not little manufactured wafers and juice/wine. And that IS addressed in Scripture, but I don't see many churches saying, "you know, let's not have these peffy wafers remembering the Lord, let's have feasts, to foreshadow the feast we will partake when the Bridegroom marries." It's interesting the logic behind using such a small substance, that you take individually in your pews with little actual fellowship during, to celebrate such a great God. And the issue Paul had was not the size of the feast but the selfishness and gluttony or certain members.
Catholics imo, don't have the best theology, and flawed in many conclusions. I see problems with the Protestant approach as well. I just try to send things from both sides.