Jesus himself said to the Samaritan woman that God is a spirit:

“God is Spirit, and those who worship him must worship in Spirit and truth.”
John 4:24

A spirit doesn’t need space and cannot die

The visible universe, including you and me, is made out of matter that requires space to occupy. But, a spirit is a being that is not made out of matter. Therefore, it doesn’t need space.

A spirit is a whole being and doesn’t have parts that can be divided into smaller parts. As such, it cannot decay or be destroyed. Thus, it cannot die; it is immortal.

A spirit knows, loves, and wills

A spirit can know things. It can understand, learn, and formulate ideas. It also can love and be loved in return. It can also will, which means it can decide to do something.

On Mount Sinai, God gave Moses a mission to lead his people out of Egyptian slavery. Since different nations and cities worshipped different gods during that time, Moses asked God for his name to know which one to whom he was speaking.

God replied, “I am who am.” This is not a name. Instead, God was revealing to us his eternal nature.

“In revealing his mysterious name, YHWH ("I AM HE WHO IS", "I AM WHO AM" or "I AM WHO I AM"), God says who he is and by what name he is to be called. This divine name is mysterious just as God is mystery. It is at once a name revealed and something like the refusal of a name, and hence it better expresses God as what he is - infinitely above everything that we can understand or say: he is the "hidden God," his name is ineffable, and he is the God who makes himself close to men.
CCC § 206

The moment Mary consented to God’s plan with her words, “Behold, I am the handmaid of the Lord. May it be done to me according to your word,” the Holy Spirit overshadowed her and she conceived Jesus.

It is at this point God became flesh. We refer to this as The Incarnation that comes from the root word that means “meat” or “flesh.” It basically means, “to make something flesh.”

In the process of the incarnation, however, the Son did not lose his divinity.

The incarnation compels us to make a choice

Christianity is neither a remember-what-Jesus-did club, nor let’s-follow-what-Jesus-taught society (although these are part of it.) Christianity, in its strictness sense, is a who-Jesus-is assembly. We profess that he is the incarnate Son of God, and that makes all the difference.

We can accept his divinity as the truth, or reject it as a lie, but there can be no in between. C.S. Lewis says it eloquently:

“Either this was, and is, the Son of God, or else a madman or something worse. You can shut Him up for a fool or you can fall at His feet and call Him Lord and God. But let us not come with any patronizing nonsense about His being a great human teacher. He has not left that open for us.
C.S. Lewis , Mere Christianity

In the Annunciation, the Angel Gabriel told Mary she would conceive. In reply, Mary asked the angel, “How can this be, since I have no relations with a man?”

This was an odd question since she was already betrothed to Joseph at that time. In the Jewish tradition of that period, they were already as good as husband and wife; the only thing Joseph needed to do was take her home so she could live with him. For a wife, it shouldn’t be puzzling how she was to get pregnant. Mary’s answer reveals to us her plan from the start: she wasn’t planning to have marital relations with Joseph.

The angel explained that the Holy Spirit will overshadow her, and so Mary conceived without a human agent. This is the miraculous conception and birth of Jesus.

The Church, therefore, teaches us that Mary was a virgin before the conception of Christ, during the birth of Christ, and after the birth of Christ.

Mary had no other children

Scripture is seemingly littered with verses where Mary had other children. We have to take into consideration that the Bible was written in Greek and the words used for these verses are “adelphos or adelphoi” and these did not only mean blood-brother, but close relatives as well.

For example, in the King James Version of the Bible, Lot is said to be “Abraham’s brother’s son.” That makes Lot the nephew of