Christian questions

Update: I would like to question the text now highlighted in yellow. For more, please  see my Translator's Preface to The Christ Family Bible.

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"Pride goes before destruction, and a haughty spirit before a fall." (Proverbs 16:18)
Should anyone follow a theologian who disagrees with any parts of the New Testament and Old Testament?

"Remember then from what you have fallen; repent, and do the works you did at first. If not, I will come to you and remove your lampstand from its place, unless you repent." (Revelation 2:5, NRSV)
Is there evidence that the Holy Spirit has been removed from churches that ignore God's Word? 

"And just as they did not deem God worthy to have in knowledge, God gave them over to an unworthy mind, to do those things that are not fitting, being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers, backbiters, haters of God, insolent, proud, boasters, inventors of evil things, disobedient to parents, without understanding, covenantbreakers, without natural affection, implacable, unmerciful...." (Romans 1:28-31, AKJV modified)
When these types of disgraceful behaviours are seen to endure in a church, is there a better explanation than that God has kept His Word?

"My child, when you are ill, do not delay, but pray to the Lord, and he will heal you. Give up your faults and direct your hands rightly, and cleanse your heart from all sin. Offer a sweet-smelling sacrifice, and a memorial portion of choice flour, and pour oil on your offering, as much as you can afford. Then give the physician his place, for the Lord created him; do not let him leave you, for you need him. There may come a time when recovery lies in the hands of physicians, for they too pray to the Lord that he grant them success in diagnosis and in healing, for the sake of preserving life. He who sins against his Maker, will be defiant toward the physician." (Sirach 38:9-15, NRSV)

Who takes responsibility for millions of Protestants taught not to heed Sirach as holy scripture, being led into shameful, preventable suffering and deaths of children among others? 

“I ask not only on behalf of these, but also on behalf of those who will believe in me through their word, that they may all be one. As you, Father, are in me and I am in you, may they also be in us, so that the world may believe that you have sent me." (John 17:20-21, NRSV)

How can any person believe he has a right to split the Church, the Body of Christ, by insisting on his own Biblical canon and interpretation, without the test of an ecumenical council led by the Holy Spirit (Acts 15)?

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NRSV: New Revised Standard Version Bible, copyright © 1989 the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.
AKJV: AKJV reproduced by permission of Cambridge University Press, the Crown’s patentee in the UK.