In the Bible, Ezekiel 18:20, it proves that mortal sin does not exist so why do Catholics insist that it does?

The book of the Bible, Ezekiel, chapter eighteen, verse twenty states: The soul who sins is the one who will die. The son will not share the guilt of the father, nor will the father share the guilt of the son. The righteousness of the righteous man will be credited to him, and the wickedness of the wicked will be charged against him. (New International Version of the Bible). This Bible verse clearly states that infantile babtism is wrong, therefore, why do Catholics continue to pursue this extremely unbiblical act?