Why should we not believe in transubstantiation?

Elena asked,
Why cannot it be understood as literally Christ giving his body to eat?

She was referring to this quote she gave from Ambrose:
It is wonderful that God rained manna on our fathers and they were fed with daily food from heaven. And so it is written: Man ate the bread of angels. Yet those who ate that bread all died in the desert. But the food that you receive, that living bread which came down from heaven, supplies the very substance of eternal life, and whoever will eat it will never die, for it is the body of Christ. Ambrose of Milan, treatise On the Mysteries was originally spoken to newly baptized Christians around the year 370 AD.
This quote is apparently referring to John 6. I would like to give a few scriptures to show why Jesus in John 6 is not referring to Christ literally giving us His body and blood to eat, and that the bread is not literally the 'body, soul, and divinity of Christ' or the whole Christ.
Matthew 24:23 “Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it. 24 For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect. 25 See, I have told you beforehand.
26 “Therefore if they say to you, ‘Look, He is in the desert!’ do not go out; or ‘Look, He is in the inner rooms!’ do not believe it. 27 For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.
This passage says that if anyone tells you that Christ is here or there on earth DO NOT BELIEVE IT and DO NOT GO OUT to look for Him, because His coming will be 'as the lightning come from the east and flashes to the west'. Jesus is telling His disciples that He will NOT be present physically on earth until He comes again in the sky, and not to believe anyone who says He is, even though you see signs and wonders to prove that it is He.
John 19:30 He said, “It is finished!” And bowing His head, He gave up His spirit.
Hebrews 10:16 “This is the covenant that I will make with them after those days, says the LORD: I will put My laws into their hearts, and in their minds I will write them,” 17 then He adds, “Their sins and their lawless deeds I will remember no more.” 18 Now where there is remission of these, there is no longer an offering for sin.
Jesus finished His propitiatory work on the cross and for those who believe in Him, their sins are forgiven and there is no more need for an offering for sin.
Hebrews 9:25 not that He should offer Himself often, as the high priest enters the Most Holy Place every year with blood of another— 26 He then would have had to suffer often since the foundation of the world; but now, once at the end of the ages, He has appeared to put away sin by the sacrifice of Himself. 27 And as it is appointed for men to die once, but after this the judgment, 28 so Christ was offered once to bear the sins of many. To those who eagerly wait for Him He will appear a second time, apart from sin, for salvation.
This passage says that He appeared once to put away sin by His sacrifice of Himself, not often, and that He will appear for those who eagerly await Him a SECOND TIME, APART FROM SIN, for salvation. He will appear a second time when He comes back to earth, 'just as He ascended' the first time. He will appear 'apart from sin' that is, not as a sacrifice for sin. He does not come back as a physical perpetual sacrifice. Every word of Hebrews denies this doctrine. He sat down at the right hand of the Father in victory over sin and death and having finished His suffering, He intercedes for us against our accuser the devil.

UPDATE:
Elena has a post up about this too: http://mdcalexatestblog.blogspot.com/2009/08/hebrews-matthew-and-john-6.html

Sabbath Rest-Part Three: A Parting Thought

I have two earlier posts about 'The Sabbath Rest' showing how salvation through Christ is our sabbath rest, fulfilling the law of the sabbath.
Under another discussion thread, Leo, a Roman Catholic, made some comments about my posts and I wanted to share my answer as a summary of the Sabbath Rest posts.
Leo said:

Now let's talk about why Jesus healed on the Sabbath. He wanted to end the misapplication of Sabbath regulations at the expense of those who were suffering. He said that the Sabbath was made for man and not the other way around.

Jesus wanted to show that mercy always comes first. He said that it was always okay to do good, even on the Sabbath.

Here is my answer:
It is correct that Jesus wanted to teach these things, but that is not the only meaning. The sabbath was a day to rest from our labors for ourselves, but works of love are always appropriate. But how can we cease from working for ourselves, for our own salvation, until it is achieved? If we have to work to merit our salvation, then we are never working for only love and mercy, but for ourselves.
Jesus died to take our sin upon Himself and to declare us righteous by giving us His righteousness. Then we can by faith accept it, and then work by faith to show love for God first and then love and mercy for others.
First we must be free of sin by grace through faith, and only then can we do true works by faith, being made holy by the Spirit in us.

Renewed discussion on Mary under a previous post

We have been having some more discussion about Mary under an older post I did called 'Mary as the Ark of the Covenant' if anyone is interested in joining in.

Tony Bartolucci; Drowning in the Tiber: Parts 10 and 11 are now up!

Parts 10 and 11 of the sermon series Drowning in the Tiber by Pastor Tony Bartolucci of Clarkson Community Church are now available for listening. Please see the link at the top of the list of sermons to read Pastor Tony's explanation of why he is preaching this series.

Exchangedlife.com: Examining Predestination and Calvinism

My husband Eddie has just completed a study on predestination which is available on his website, exchangedlife.com. In the study, my husband looks at the issue of predestination from a Biblical perspective, hoping to resolve the conflicts between opposing camps on this subject. The study examines the scriptures that indicate free will and those that affirm the sovereignty of God and shows that these do not disagree.

NOTE: My husband is transferring his website to another location, so while this is being done, please look for the link here; then click on 'Bible Studies' and find the study on 'Examining Predestination and Calvinism' with the date '08/2009'.

Daughter of Wisdom: Discussion on the sin of Onan

Recently some readers were having an interesting discussion about the sin of Onan as reported in scripture: Genesis 38:6-10. Daughter of Wisdom has agreed to continue the discussion on her blog, as I am not able to post about it right now, being busy trying to wind up a very short summer vacation. Please visit Daughter of Wisdom to join in the discussion.