True that Truth cannot be changed. We are talking about Jesus Christ, the word of God. We know that what is written in 'the Bible' is less than all His acts and words (according to the apostle John's testimony), and that before the word of God was written down, and in the eras since the word of God was written down, God spoke and speaks sovereignly over all the other voices in this world. But only those who are seeking, or listening, hear Him.
We also know that the Holy Spirit only speaks about Christ.
So when you talk about unchanging Truth, and we talk about Christ, we are looking for agreement with the revelation of scripture. This is where the RCC falls woefully short. In a nutshell, 'Catholicism' cannot be found in the Bible.
That's the problem. All the defending of 'Catholicism' does, is indicate that Catholics don't understand the Bible. A worse problem is that to those who both know the Bible and understand it, it is clear that there have always been men in the Catholic hierarchy, who are willing to handle the word of God deceitfully.
They do 'know' what the Bible is saying, but they take the route of these teachers - Mark 11:31 And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then did ye not believe him? 32 But if we shall say, Of men; they feared the people: for all men counted John, that he was a prophet indeed.
Jesus said this of them: Matthew 23:13 But woe unto you, scribes and Pharisees, hypocrites! for ye shut up the kingdom of heaven against men: for ye neither go in yourselves, neither suffer ye them that are entering to go in. 14 Woe unto you, scribes and Pharisees, hypocrites! for ye devour widows' houses, and for a pretence make long prayer: therefore ye shall receive the greater damnation. 15 Woe unto you, scribes and Pharisees, hypocrites! for ye compass sea and land to make one proselyte, and when he is made, ye make him twofold more the child of hell than yourselves.
It's strong language, I know, but this is how seriously Jesus Christ takes false teaching. (By the way, Jesus Christ is the Door of the sheep, the door which was opened in heaven. John 10:7)
So, what are you being party to as a teacher?
What is it you have believed which has no foundation in either the Bible or Christ?
What did Christ do for you, which you are being prevented from experiencing through the holding back of 'the Truth'?
Hebrews 2:14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; 15 And deliver them who through fear of death were all their lifetime subject to bondage.
2 Timothy 1:9 Who has saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began, 10 But is now made manifest by the appearing of our Saviour Jesus Christ, who hath abolished death, and hath brought life and immortality to light through the gospel.
If Catholics knew about these truths, and believed them, they would not be afraid of death or dying, and would recognise they have been wrongly instructed as to the Way to eternal life. Many Catholic rituals would seem pagan to them, as they do to us who have heard and believed the true gospel of Jesus Christ.
2 Corinthians 3:13 And not as Moses, which put a vail over his face, that the children of Israel could not stedfastly look to the end of that which is abolished.
Notice: Paul did say 'is abolished'. This happened when Jesus Christ died, having cried out, 'It is finished'. Heb 10:20
There is nothing in Catholicism which vaguely indicates an understanding of 'It is finished', although that is the eternal truth you claim to be defending. Did you know? Jesus Christ broke the power of sin over the whole of mankind.
John 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
The reason believers need to be baptised in the Holy Spirit, is to give them power to live free from sin, and to be able to hear what God wants to reveal to their understanding, and, to obey His will from minute to minute. This is what Jesus Christ purchased for mankind, Him being the ransom which was paid in full with His life blood, to buy us back from the kingdom of darkness.
Colossians 1:9 - 23
'... we ... desire that ye might be filled with the knowledge of his will in all wisdom and spiritual understanding; that ye might walk worthy of the Lord to all pleasing, being fruitful in every good work, and increasing in the knowledge of God; strengthened with all might, according to his glorious power, to all patience and longsuffering with joyfulness; giving thanks to the Father, who has made us meet to be partakers of the inheritance of the saints in light: who has delivered us from the power of darkness, and has translated us into the kingdom of his dear Son: in whom we have redemption through his blood - the forgiveness of sins:
who is the image of the invisible God, the firstborn of every creature: for by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him: and he is before all things, and by him all things consist.
And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
For it pleased the Father that in him should all fulness dwell; and, having made peace through the blood of his cross, by him to reconcile all things to himself; by him, I say, whether they be things in earth, or things in heaven. And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled in the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight: if ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel ...'
Clearly, I am not talking about the Catholic faith. I am talking about 'the faith' to which Paul refers: the faith which appears when the word of God is preached.
This faith cannot appear when the word of God is not preached. Any other faith is fleshly and misguided, and certainly cannot save a soul.
