Mary IS the mother of God because Jesus IS God. By denying her that title you deny that Jesus is Lord. When we honour Mary, we honour Christ. You cannot separate Jesus' humanity from His divinity. He is both fully God and fully man.
Wow! I guess then we'll have to honor mothers of doctors, generals and politicians, too. I can easily deny giving Mary ANY titles and claim that Jesus is Lord.
It is the Roman Catholic Church (man) who has lifted Mary to that title. It's your "golden calf".
Let's see what Peter said in Acts 2:
14 But Peter, standing up with the eleven, raised his voice and said to them, “Men of Judea and all who dwell in Jerusalem, let this be known to you, and heed my words.
15 For these are not drunk, as you suppose, since it is
only the third hour of the day.
16 But this is what was spoken by the prophet Joel:
17 ‘ And it shall come to pass in the last days, says God,
That I will pour out of My Spirit on all flesh;
Your sons and your daughters shall prophesy,
Your young men shall see visions,
Your old men shall dream dreams.
18 And on My menservants and on My maidservants
I will pour out My Spirit in those days;
And they shall prophesy.
19 I will show wonders in heaven above
And signs in the earth beneath:
Blood and fire and vapor of smoke.
20 The sun shall be turned into darkness,
And the moon into blood,
Before the coming of the great and awesome day of the LORD.
21 And it shall come to pass
That whoever calls on the name of the LORD
Shall be saved.’
22 “Men of Israel, hear these words: Jesus of Nazareth, a Man attested by God to you by miracles, wonders, and signs which God did through Him in your midst, as you yourselves also know—
23 Him, being delivered by the determined purpose and foreknowledge of God, you have taken by lawless hands, have crucified, and put to death;
24 whom God raised up, having loosed the pains of death, because it was not possible that He should be held by it.
25 For David says concerning Him:
‘ I foresaw the LORD always before my face,
For He is at my right hand, that I may not be shaken.
26 Therefore my heart rejoiced, and my tongue was glad;
Moreover my flesh also will rest in hope.
27 For You will not leave my soul in Hades,
Nor will You allow Your Holy One to see corruption.
28 You have made known to me the ways of life;
You will make me full of joy in Your presence.’
29 “Men
and brethren, let
me speak freely to you of the patriarch David, that he is both dead and buried, and his tomb is with us to this day.
30 Therefore, being a prophet, and knowing that God had sworn with an oath to him that of the fruit of his body, according to the flesh, He would raise up the Christ to sit on his throne,
31 he, foreseeing this, spoke concerning the resurrection of the Christ, that His soul was not left in Hades, nor did His flesh see corruption.
32 This Jesus God has raised up, of which we are all witnesses.
33 Therefore being exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear.
34 “For David did not ascend into the heavens, but he says himself:
‘ The LORD said to my Lord,
“ Sit at My right hand,
35 Till I make Your enemies Your footstool.”’
36 “Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified, both Lord and Christ.”
I think he covered it all. What do we need to do, then?
37 Now when they heard
this, they were cut to the heart, and said to Peter and the rest of the apostles, “
Men and brethren, what shall we do?”
PERFECT time for Peter to say that Mary, who was RIGHT THERE IN THE ROOM WITH PETER, to say "Here she is, the "Mother of God", Herself."
WHAT did Peter reply?
38 Then Peter said to them, “Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit.
39 For the promise is to you and to your children, and to all who are afar off, as many as the Lord our God will call.”
Uh... no mention of Mary at all. How RUDE! (j/k)
Yet, YOU will then reply to this with some quotes from the 2nd century. My reply to that would be: "All the disciples were dead at that time. Even IF that person you supposedly "quoted" just MIGHT have been with one of the disciples before they died, you CANNOT say that that was what the certain disciple actually SAID. Nobody was there in the 2nd century to say to them, "that's NOT the way it happened, you're wrong."
Example: I could say something about my great-grandparents. Something GREAT. However, I would never have known because they died before I was born. Now, if you found a diary that they actually kept, in their own writing, THEN you would get the TRUTH from their own writings; their own EYEWITNESS.
The words of Jesus and His disciples quoted, in your own "bible", are not even followed by the current Roman Catholic Church. If so, then this whole "wear my scapular" and "pray my rosary" would've been challenged and tested to the foundation of the Christian faith: the Gospels and the writings of Paul, James and John.
The "writings" of the 2nd century has resonable doubt. The 1st Century, however, is solid.