What is meant by complete unity in verse 23? I ask this question because I have been troubled this past year since the Lord brought me back (a prodigal son) regarding the many denominations and their theological differences (mainly salvation). Eph 4:3-5 keeps playing in my head. What is the Truth? Any help would be greatly appreciated!
Well, what denominations actually claim to be the One True Church -- the Catholic Church, the Orthodox Catholic Church, and a couple small groups (SDA, Mormons, various Fundamentalists, etc.). Everyone else is just throwing out their personal opinions, what is the point of that? This group makes up a "Statement of Faith" and various "Position Statements" and another one makes up a contrary one, who cares about their personal opinions?
Eliminating various small sects claiming to have a prophet from God telling them some new revelation (which would be contrary to what Christ established, which was for all people, for all time), leaves you between the Catholic Church and the Orthodox Catholic Church.
Then you have to examine the claims of each and determine which is the more reasonable.
Jesus didn't just come and say "I'm God!" and expect people to believe Him. Then He would be no different than any nutjob on the corner saying the same thing. He said:
Jn 10:36-38 said:
Do you say of him whom the Father hath sanctified and sent into the world: Thou blasphemest, because I said, I am the Son of God? If I do not the works of my Father, believe me not. But if I do, though you will not believe me, believe the works: that you may know and believe that the Father is in me, and I in the Father.
Jesus said we should examine His credentials and make a reasoned choice to believe Him based on the miracles He did (most clearly, His Resurrection). Therefore, your faith should be a reasonable one based on evidence and logic. The best example of this is St. Thomas Aquinas'
Summa Theologica, it's almost impossible to read it straight through but it's your resource for most questions on the faith. Then you look at the evidence of Catholic saints throughout the ages -- clearly and dramatically holy men and women -- they are part of the evidence of the holiness of the Catholic religion. If you can look at these men and women and read what they have wrote and their life stories and not see the hand of God, then "believe me not"; but if you do see something special, something Godly, you can't deny that there is something going on here, some holiness present in the Catholic Church.