Teach, baptise, observe commandments, and then a promise to be with them all days until the consummation of the world.
Hello Xeno, interestingly, you forgot two of the Lord's commands in your breakdown of v19, did you not (the two 'principal' commands of the Great Commission, actually), "Go" and "Make Disciples"
While it's certainly true that
Matthew 28:19-20 is what is directly referred to as "The Great Commission", the Lord did say other things to us just prior to His Ascension, things that expand our understanding of The Great Commision (that are indeed part of it), the most important things that He wanted us to do going forward, following His Ascension.
Mark 16
15 He said to them, “Go into all the world and preach the gospel to all creation.
Acts 1
8 "You will receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth.”
the evangelical people I have met who have claimed that they fulfil this passage usually do not administer baptism and teach very little, some of them teach people not to observe the commandments because that's "Old Testament" and "you're justified by faith alone" they say. They could not be more wrong, and less faithful to the words of Christ. One hopes that their pastors do better.
I believe that it is possible to participate in/help fulfil The Great Commission without completing every part of it in each person's life.
Take the Apostle Paul, for instance, who certainly fulfilled command #1 of The Great Commission which is "Go". And no one would argue that He failed to present the Gospel and lead people to Christ, and/or teach them, then, how to grow up in the faith/in Christlikeness.
But did he "fulfil" the Great Commission in the manner that you suggest above? Here are two important points that he made that need to be considered in regard to that.
1 Corinthians 1
17 Christ did not send me to baptize, but to preach the gospel, not in cleverness of speech, so that the cross of Christ would not be made void.
1 Corinthians 3
6 I planted, Apollos watered, but God was causing the growth.
7 So then neither the one who plants nor the one who waters is anything, but God who causes the growth.
8 Now he who plants and he who waters are one; but each will receive his own reward according to his own labor.
The Great Commission is carried out by us all, most often in parts and pieces, which was even true of the Apostles and the Disciples in the 1st Century (as you can clearly see in
1 Corinthians 3:6-8 above).
In fact, the primary (first and foremost) goal of witnessing/evangelism/missions is to be a planter or waterer (of seeds), not a reaper (not that we do not long to see people come to saving faith in Christ personally, but few, if any [unbelievers] do so the first time that they hear the Good News ..
Romans 10:17, nor the second time, nor the third, etc.).
So, we don't often meet an unbeliever who we not only get to witness to, but also get to see (personally) come to saving faith, then join the church and get baptized, and then grow to maturity as a believer, but we do get to participate in 'some' of that along the way in people's lives, if we choose to obey command #1 of the Commission to "Go"
You talk about the importance of obeying the Lord's commands, so why not choose to obey this one too? (remembering the fact that
it was not the 12 alone who were commissioned and sent by Lord Jesus during His ministry years,
but the 70 too, His disciples, which is exactly what 'we' are today, yes?).
BTW, I too have heard people (principally full-time missionaries) say to other believers that they are out there "fulfilling" or "helping to fulfil" the Great Commission, by which they mean that they are part of the "ongoing process" of doing so (which is what is always meant by that statement).
God bless you!!
--David