The Catholic Church says:
CCC 460 "For the Son of God became man so that we might become God."
Jesus said, “Be perfect, even as your Father in heaven is perfect.”
Various translations say therefore in the place of even, some add righteous to the quote as in “be righteous and perfect.”
Only God is perfect and only God is righteous, yet Jesus says we are to be both.
St. Peter in his 2nd epistle says that we are partakers in the divinity of Christ and the NT tells us that we, Christians, are now sons and daughters of God, heirs to the kingdom.
The psalmist says in PS 82:[6] I say, “You are gods,
sons of the Most High, all of you; and that is what Jesus tells us in the NT.
Read John 17 for a little better understanding of the theology behind the Western teaching of theosis and the Eastern teaching of divinization.
Language is a very powerful thing and as was stated earlier in this thread, there is very different understandings of certain words and phrases between a Catholic and a Protestant.
It is misleading to take one quote of a revered saint of the Church without any context or understanding of the entire theological concept that saint is conveying.
Yes, the Catechism uses only the one line, but it is used in context with the entire teaching within the chapter and within the whole of Catholic theology.
The Church never has and never will claim that any created human can become God. On its face it is just silly to claim that is our belief.