Is she not the Mother of Jesus Christ, who is all grace?

Lutero:

Unfortunately, there are way too many unlearned folks in the world that think that the RCC is representative of Christianity. They need to get into the word of God for the truth of the matter. Yes, the false church soils the reputation of the true.

You said it. The Catholic Church is the True Church. And the non Catholics are soiling the name of Christ.

Now, let us go through the OP.

Calvino:
There was this thread going around a few days ago intitled
The ignorance of "ex-Catholics" soiling the reputation of the Church

I think its the other way around, RC are spoiling the Christian name by
1. saying they eat the flesh and drink the blood of our Saviour at communion every Mass

1 Corinthians 11:23-30

King James Version (KJV)
²³ For I have received of the Lord that which also I delivered unto you, that the Lord Jesus the same night in which he was betrayed took bread:
²⁴ And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
²⁵ After the same manner also he took the cup, when he had supped, saying, this cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
²⁶ For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
²⁷ Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.
²⁸ But let a man examine himself, and so let him eat of that bread, and drink of that cup.
²⁹ For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.
³⁰ For this cause many are weak and sickly among you, and many sleep.

2. by offering a re presentation of the pure victim Jesus Christ our Saviour to our God the Father for forgiveness of their sins and those of the whole world at every Mass.

John 6:51

King James Version (KJV)
⁵¹ I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.

3. Some of them claim to time travel back in time at mass and they are at Calvary and connect themselves to Christ's suffering on the Cross.

I'm not exactly sure what this is about. But there is no need for us to time travel. God provides for us His flesh that we may participate in the Sacrifice of Calvary.

4. Over veneration of Mary, calling her the Mother of God,

Luke 1:43

King James Version (KJV)
⁴³ And whence is this to me, that the mother of my Lord should come to me?

and calling her the Spouse of the Holy Spirit,

Luke 1:35

King James Version (KJV)
³⁵ And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.

the Queen of Heaven,

Revelation 12:1

King James Version (KJV)
1 And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars:

The Ark of the New Covenant,

Revelation 11:19-Rev 12:1

King James Version (KJV)
¹⁹ And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail. 12:1 And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars:

Giver of all Graces,

Is she not the Mother of Jesus Christ, who is all grace?

Mother of all.

Revelation 12:17

King James Version (KJV)
¹⁷ And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.

These are just a few of the things, I read a non Chrisitan say Christians eat their God.

That is true. We eat of our Lord, Jesus Christ and thereby partake of the Divine Nature:
2 Peter 1:4

King James Version (KJV)
⁴ Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.

Sincerely,

De Maria