It is rather clear that you do not understand the meaning of the word, "definitive".
a. serving to provide a final solution or to end a situation.
b. authoritative and apparently exhaustive
c. serving as a perfect example
d. serving to define or specify precisely
Merriam-Webster.com
I do understand the meaning of the word, definitive.
You cannot add to a definitive.
I'm not adding to a definitive, you are. You add repent, confess, baptism to believe on the Lord Jesus Christ and you will be saved. You also reverse the scriptural order of repent and believe.
If Ephesians 1:13 is truly definitive (as you claim) then adding verbal confession or injecting a mandatory detail on what is to be believed is wrong.
Ephesians 1:13 says
believe the gospel "apart from additions or modification" and the result is sealed in Him with the Holy Spirit of promise. To believe the gospel is to trust in the death, burial and resurrection of Christ as the ALL-sufficient means of our salvation. Ephesians 1:13
does not say, believe the gospel, then
afterwards verbal confession, then
after that baptism, then finally you are sealed in Him with the Holy Spirit of promise.
Once again, confessing with our mouth that Jesus is Lord and believing in our heart that God raised Him from the dead are
not two separate steps to salvation (believe today/still lost; confess next week/finally saved next week)
but are chronologically together, so I'm not adding verbal confession to a definitive. If confession was a separate, distinct requirement to become saved "after" we believe the gospel/place faith in Christ for salvation (believe the gospel today/still lost; confess next week/finally saved next week) then multiple passages of Scripture would be incomplete and wrong (John 3:15,16,18; 6:40,47; 11:25,26; Acts 10:43; 13:39; 16:31; Romans 1:16; 3:22-28; 4:5; 10:4; Galatians 2:16; Ephesians 2:8 etc..) God forbid!
Romans 10:8 - But what does it say? "THE WORD IS NEAR YOU,
in your mouth and in your heart" (together) that is, the word of faith which we are preaching. It's not the confession in of itself that saves you as an additional requirement after faith. It's the faith behind the confession. So what about someone who is unable to speak (moot). How could they confess with their mouth? Such a person would remain lost according to your erroneous interpretation of Romans 10:9,10.
*If we must be water baptized before we are saved (baptism made unto salvation), then Romans 10:9,10 is wrong. Confess precedes water baptism in your 4 step plan of salvation and Paul said "confession is made unto salvation." hmm...
This is the common error of the "trust only" sects, an error that they are willfully blind to.
The people who are willfully blind are the "trust in works" sects who stubbornly refuse to believe the gospel/trust in Christ alone for salvation. Paul explains why in 2 Corinthians 4:3 - But if our
gospel be hid, it is
hid to them that are lost: 4 In whom the
god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
Taking verses such as John 3:16 and painting them with such a broad brush as to imply that they are all-encompassing and exhaustive in detail is foolishness. This type of reasoning is used to prop up the "trust only" theology. This train of thought would never be used in other parts of the Bible or even in our daily lives.
So what Jesus said in John 3:16 is a lie? Did Jesus really mean to "add a check list of works" to John 3:16 but forgot to mention it? Your reasoning is foolishness. 1 Corinthians 1:18 - For the
preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
Roman Catholics seem to have bought into your faulty human logic as well.
I was once in a discussion with a Roman Catholic who claims that the Roman Catholic church does not teach salvation by works (just because they don't teach we are saved by perfectly obeying the law), but then afterwards, he said this below:
We ARE saved by faith - as long as you properly define "Faith".
Faith is NOT simply "believing". Faith INCLUDES:
Being baptized, Eating His body and drinking His blood/partaking the Lord's Supper during Mass, Works of mercy and charity, Obeying his commandments.
Of course that is absolutely false! What this Roman Catholic is saying is that faith "is" baptism, faith "is" multiple acts of obedience, faith "is" works. It's no wonder that people teach salvation by works when they basically define faith as works and try to "shoe horn" works "into" salvation through faith. 
Example: Would you label Proverbs 22:6 as definitive and blame the parents for the sins of the children?
Example: Demand a store accept your Canadian dollars since the tv ad did not specify U.S. dollars?
There are tacit understandings in both verbal and written language that cannot be ignored.
It is this willful ignorance that the "trust only" theology is built on.
It's your willful ignorance that causes you to trust in "water and works" for salvation and NOT in CHRIST ALONE. Then you use faulty human logic to try and explain away the truth. Your Campbell soup theology is the result of bad semantics and flawed hermeneutics and you desperately need to repent and believe the gospel. Only then will the blinders be removed.
