II. Matt. 18:2. The same is taught by the parable when Christ in the same dispute concerning the kingdom places a little child in the midst, signifying that among ministers there is not to be sovereignty, just as a child neither takes nor seeks sovereignty for himself.
Matt. 18:1-5 ~ *****At that time the disciples approached Jesus and said, “Who is the greatest in the kingdom of heaven?” He called a child over, placed it in their midst, and said, “Amen, I say to you, unless you turn and become like children, you will not enter the kingdom of heaven. Whoever humbles himself like this child is the greatest in the kingdom of heaven. And whoever receives one child such as this in my name receives me.”
*This discourse of the fourth book of the gospel is often called the “church order” discourse, but it lacks most of the considerations usually connected with church order, such as various offices in the church and the duties of each, and deals principally with the relations that must obtain among the members of the church. Beginning with the warning that greatness in the kingdom of heaven is measured not by rank or power but by childlikeness (Matthew 18:1-5), it deals with the care that the disciples must take not to cause the little ones to sin or to neglect them if they stray from the community (Matthew 18:6-14), the correction of members who sin (Matthew 18:15-18), the efficacy of the prayer of the disciples because of the presence of Jesus (Matthew 18:19-20), and the forgiveness that must be repeatedly extended to sinful members who repent (Matthew 18:21-35).
*The initiative is taken not by Jesus as in the Marcan parallel (Mark 9:33-34) but by the disciples. Kingdom of heaven: this may mean the kingdom in its fullness, i.e., after the parousia and the final judgment. But what follows about causes of sin, church discipline, and forgiveness, all dealing with the present age, suggests that the question has to do with rank also in the church, where the kingdom is manifested here and now, although only partially and by anticipation; see the notes on Matthew 3:2; 4:17.
*
Become like children: the child is held up as a model for the disciples not because of any supposed innocence of children but because of their complete dependence on, and trust in, their parents. So must the disciples be, in respect to God.
*Matthew 10:40 ~ “Whoever receives you receives me, and whoever receives me receives the one who sent me.” (All who receive the disciples of Jesus receive him, and God who sent him, and will be rewarded accordingly.)
*One of these little ones: the thought passes from the child of Matthew 18:2-4 to the disciples, little ones because of their becoming like children. It is difficult to know whether this is a designation of all who are disciples or of those who are insignificant in contrast to others, e.g., the leaders of the community. Since apart from this chapter the designation little ones occurs in Matthew only in Matthew 10:42 where it means disciples as such, that is its more likely meaning here. Who believe in me: since discipleship is impossible without at least some degree of faith, this further specification seems superfluous. However, it serves to indicate that the warning against causing a little one to sin is principally directed against whatever would lead such a one to a weakening or loss of faith. The Greek verb skandalizein, here translated causes . . . to sin, means literally “causes to stumble”; what the stumbling is depends on the context. It is used of falling away from faith in Matthew 13:21. According to the better reading of Mark 9:42, in me is a Matthean addition to the Marcan source. It would be better . . . depths of the sea: cf Mark 9:42.
Bold added by me. Bible quotes and footnotes from
www.vatican.va/.
This seems to me to be more of an exhortation to have the faith of a little child, rather than apologetics for disproving the Office of the Supreme Pontiff.
The parallel in **Mark 9:33-37 **~ *They came to Capernaum and, once inside the house, he began to ask them, “What were you arguing about on the way?” But they remained silent. They had been discussing among themselves on the way who was the greatest. Then he sat down, called the Twelve, and said to them, “If anyone wishes to be first, he shall be the last of all and the servant of all.” Taking a child he placed it in their midst, and putting his arms around it he said to them, "Whoever receives one child such as this in my name, receives me; and whoever receives me, receives not me but the one who sent me. "
[33-37] Mark probably intends this incident and the sayings that follow as commentary on the disciples’ lack of understanding (Mark 9:32). Their role in Jesus’ work is one of service, especially to the poor and lowly. Children were the symbol Jesus used for the anawim, the poor in spirit, the lowly in the Christian community.
Bold and underlined added by me. Bible quotes and footnotes from
www.vatican.va/.
I don’t think in any of the selected objections of the Lutherans there is a serious challenge to the Supreme Pontiff. What I DO see is some Biblical interpetation…

Their leaders interpret, just as ours do.