Nobody denies that.
It would really help if you at least looked at what our teachings are before you dismiss them.
I know the teachings. I tend to go with what is known from Scriptures. We know Blessed Mary had a human mother and human father. We know she was a virgin when Gabriel proclaimed: “The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God.”
We know these things they are certain.