Is it permissible to marry a committed girl whom the father rejects because she is of a different nationality, knowing that the father does not pray and does not approve of his son's commitment, and that the son is the one who supports the family and needs to get married to maintain chastity?

Thank you for your uprightness. We advise you to supplicate, as it will help you achieve your goal. If the girl is pleasing in her religiosity, your father should not refuse his approval, nor is it permissible for him to do so merely because she is not Arab. Try to convince him through mediators. If he agrees, then so be it. Otherwise, the default is the obligation to obey him, unless you fear real harm by leaving her. In that case, it is permissible to marry her while trying to appease your father. Do your best to show him filial piety, leave her, and search for someone else, for your father may have foresight in this matter, and he is compassionate towards you and keen on your well-being. Know that among the greatest acts of piety towards him is to strive for his betterment and guidance in religion, and to advise him with wisdom and good admonition.