Jesus was before the cross, and remains, the Rock upon which His body, the ecclessia (Church) is built. Christians are the building blocks set upon Him the Chief corner stone. He didn't begin with that at Pentecost, but as soon as He had a body on earth. That body was ordained at His water baptism, by the Holy Spirit, presided over by the Father who commended His Son. His gospel began the same as it is now, the message of good news. He preached it, His apostles preached it, and many disciples preached it before Pentecost. At Pentecost the Holy Spirit was made available to 120 people already in Christ, indwelling them with power for the first time. They didn't become believers that day. They were the Church Jesus died for. That spread quickly to 3,000 in one day.
The English word "rule" is not what you think. It isn't set for the elite, or the brightest theologians in the congregation, who are as you declared often inept. The best of the apostles was a naked fisherman, made into the top apostle. Paul said they should set the least esteemed among believers to judge over even the simplest matters, like brother suing brother in from of unbeliever's courts. 1 Cor 6
What's your affiliation? I'm full gospel non-denominational (also made up of inter-denominations and former world religious folks), having come by way of unbeliever, then So. Baptist by way of Billy Graham, then Charismatic, then Assemblies of God. Now I am free to preach, teach and evangelize wherever God sends me, not limited to wherever the District Superintendent authorizes me to minister. Each congregation has their own charter and are sovereign entities directly under Jesus Christ, led of the Holy Spirit, baptized in the Spirit with evidence of speaking in tongues. Most pastors have gone through Bible college or seminary, having been perfected rapidly even in their youth, not ill-equipped, but studied and not ashamed.
2 Timothy 2:14-18 (KJV)
14 Of these things put them in remembrance, charging them before the Lord that they strive not about words to no profit, but to the subverting of the hearers.
15 Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.
16 But shun profane and vain babblings: for they will increase unto more ungodliness.
17 And their word will eat as doth a canker: of whom is Hymenaeus and Philetus;
18 Who concerning the truth have erred, saying that the resurrection is past already; and overthrow the faith of some.
Consider how far back the Rock (Jesus) is plainly evident among men. He didn't become the Christ at Calvary, but was always Christ, the foundation for the Church.
1 Corinthians 10:1-17 (KJV)
1 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
2 And were all baptized unto Moses in the cloud and in the sea;
3 And did all eat the same spiritual meat;
4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and
that Rock was Christ.
5 But with many of them God was not well pleased: for they were overthrown in the wilderness.
6 Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
7 Neither be ye idolaters, as
were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
8 Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
9
Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
10 Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer.
11
Now all these things happened unto them for ensamples: and they are written for our admonition, upon whom the ends of the world are come.
12 Wherefore let him that thinketh he standeth take heed lest he fall.
13 There hath no temptation taken you but such as is common to man: but God
is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear
it.
14 Wherefore, my dearly beloved, flee from idolatry.
15 I speak as to wise men; judge ye what I say.
16 The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
17 For we
being many are one bread,
and one body: for we are all partakers of that one bread.
He goes back way before that, being Creator without beginning or end. He is the Rock of ages, the One saying to Peter the Church would build upon Himself, not upon Peter, but upon the truth of the revelation Peter received of who Jesus was, the Christ of God. Peter died and there has been no more St. Peter's reincarnated as Popes.
Beware men who would rule over you with power instead of being a living witness of Christ, leading people to Him. Be like Jesus, not some man with a forbidden title "Father" or any other high minded label. If you are an elder, you should be a leader of lowest self esteem, a servant not a master, and by that a friend of Christ, not His servant.