Perhaps you can explain it this way:
The act of bowing or bending the knee before the pope and kissing his ring is not an act of worship, but rather a sign of respect for his office as the Vicar of Christ and Pastor of the universal Church on earth. Catholics worship God alone.
The
Catechism of the Catholic Church:
2096 Adoration is the first act of the virtue of religion. To adore God is to acknowledge him as God, as the Creator and Savior, the Lord and Master of everything that exists, as infinite and merciful Love. “You shall worship the Lord your God, and him only shall you serve,” says Jesus, citing Deuteronomy.13
2097 To adore God is to acknowledge, in respect and absolute submission, the “nothingness of the creature” who would not exist but for God. To adore God is to praise and exalt him and to humble oneself, as Mary did in the Magnificat, confessing with gratitude that he has done great things and holy is his name.14 The worship of the one God sets man free from turning in on himself, from the slavery of sin and the idolatry of the world.
2134 The first commandment summons man to believe in God, to hope in him, and to love him above all else.
2135 “You shall worship the Lord your God” (Mt 4:10). Adoring God, praying to him, offering him the worship that belongs to him, fulfilling the promises and vows made to him are acts of the virtue of religion which fall under obedience to the first commandment.
“The word "worship”… comes from the Old English weorthscipe, which means the condition of being worthy of honor, respect, or dignity. To worship in the older, larger sense is to ascribe honor, worth, or excellence to someone, whether a sage, a magistrate, or God.
For many centuries, the term worship simply meant showing respect or honor, and an example of this usage survives in contemporary English. British subjects refer to their magistrates as “Your Worship,” although Americans would say “Your Honor.” This doesn’t mean that British subjects worship their magistrates as gods (in fact, they may even despise a particular magistrate they are addressing). It means they are giving them the honor appropriate to their office, not the honor appropriate to God.”
Full text is
here.
To further illustrate this point, turn to 1 Chronicles 29:20-21:
“Then David said to the whole assembly, “Praise the Lord your God.” So they all praised the Lord, the God of their fathers; they bowed low and fell prostrate before the Lord and the king.”
Any non-Catholic reading this verse would be able to make the distinction between the act of worship to God and the act of giving honor to the king.
Answer continues below…