You are reading a tafsir for the group of verses 21:24 to 21:25

The assumption of there being anyone worthy of worship other than God is not based on any real reasoning, but on total ignorance. Those who assign partners to God have no argument in support of their belief—neither is it based on human knowledge nor on divine revelation. On hearing arguments in favour of the oneness of God, they become evasive and turn their backs, not because of the firmness of their belief based on sound reasoning, but purely because of their prejudice. On account of their biased attitude, they have become so rigid in their belief that they are not prepared to give it up, in spite of its being untenable on the basis of reasoning.