Yes, God created everything. In the Nicene Creed at Mass, we state that God is the maker of "all things visible and invisible". Our Guardian Angels, like all of the angels, are included in the invisible part of Creation. (They are purely spiritual beings and do not have material, visible bodies like human beings do.) Paragraphs 328-336 in the
Catechism of the Catholic Church have more information about the angels.
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