Many Christians approach the Scriptures this way
Actually the majority of Christian do because it has been established from the earliest times that the whole canon of scripture, in its entirety, is a love letter from God to anyone who choose to embrace it.
2Ti 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
You are the first individual that I've heard, who interprets scripture in such a fashion. And seriously, it is wrong. Your way of interpretation or acceptance of scripture is selective, discriminatory and even convenient. It is subject to your whims and dismissable when it may rub you the wrong way.
Do you believe one must repent of their sins before they can be saved? Probably not, because all scriptures concerning repentance were spoken to the people of New Testament times or Old Testament, certainly not directly to you. Whether to the Ephesians, or Sardis, or the general populace, repentance is certainly not for you as this concept (Your word) is a matter of history and spoken to others. Maybe you do believe in repentance, that is good, you selected that concept well. However it is not a concept, it is a command.
I hope you see where I'm going? You cannot pick and choose your scriptures at your convenience. Every iota of His word is truth and relevant one way or another to anyone who chooses to submit to it.
Even Paul does this, he says to his readers that the things that happened in the OT were for our "Understanding". He doesn't say the things in the OT were written to us (Paul and his readers), he says they were written for our (Paul and his readers) understanding. Likewise, I read the NT like it was written for my understanding but not to me. That may not seem like that big of a deal, but it plays a role in how we understand the Scriptures. Let me explain. If I understand Paul words as written to me, then I have to believe that the gifts he speaks of have not ended because he says to desire Spiritual gifts. However, if I understand Paul's words as pertaining to the Corinthians, I can see where He tells "Them" to desire Spiritual gifts and yet also tells them the gifts would end. Therefore his words, 'Desire Spiritual gifts' may not apply to me. If the gifts have ended then those words of Paul "don't" pertain to me, if the gifts haven't ended then those words of Paul "do" apply to me.
The problem with this statement is that the words of scripture are not Paul's words to the Corinthians, they are GOD'S words to the Corinthians and they are GOD'S words for you and me. The Bible is GOD's infallible word given to His people as wisdom, knowledge and a Lamp unto our feet. It is our roadmap for life. It is certainly not a conglomeration of stories and letters where we get to choose what fits our situation at a particular time.
Regarding Ephesians 4 it is my understanding that the Greek grammar doesn't allow for the interpretation of offices, ie. pastor teacher, prophet, evangelists etc. Rather, Paul is saying that Christ literally gave some men as pastor teachers, prophets, evangelists, etc.
These gifts are referenced in 1Cor. (12:5) and translated as administrations or ministries. The Greek word is "Diakonia" which Strongs suggest as translation:
1) service, ministering, esp. of those who execute the commands of others
2) of those who by the command of God proclaim and promote religion among men
a) of the office of Moses
b.)of the office of the apostles and its administration
c) of the office of prophets, evangelists, elders etc.
3) the ministration of those who render to others the offices of Christian affection esp. those who help meet need by either collecting or distributing of charities
4) the office of the deacon in the church
5) the service of those who prepare and present food
Jesus is the King of a Kingdom (not a democracy) and as such He rules over His subjects in compassionate leadership and righteous judgment. And just as God places authorities in this world to whom we are called to submit to, so does Jesus delegate His authority to the 5 ministries of Ephesians 4. Now maybe we are arguing semantics, I don't know, but these individuals are called specifically by Him to perform in the sevenfold areas as previously listed.
My suggestion is instead of trying reason out Scripture with your own understanding, as this seems a popular word in your statement above, allow the Holy Spirit to reveal the Word in all its glory to you. It is a Word that feeds and produces life even when we do not comprehend it.
I trust I wasn't too harsh on you.
God Bless.