It is one of the beauties of Islam that, with respect to the treatment of parents, it forbids the Muslim to be disrespectful to them even if they should be non-Muslims who are fanatical to the point of arguing with him and putting pressure on him to renounce Islam. Allah Ta’ala says:
…Be grateful to Me and to thy parents; to Me is (the final) goal. But if they strive to compel thee to associate with Me that of which thou hast no knowledge, do not obey them; but keep company with them in this life in a kind manner and follow the way of those who turn to Me. Then to Me will be your return and I will inform you ((of the meaning of) all that you did. (31:14-15)
In these two verses the Muslim is commanded not to obey his parents in what they try to tell him to do in this regard, since there cannot be obedience to a creature in sin against the Creator-and what sin could be greater than associating partners with Allah?
At the same time, he is commanded to treat them honorably in this world, unaffected by their stand against his faith, and to follow the path of those righteous Believers who turn to Allah and to leave the judgement between himself and his parents to the Most Just of Judges, on a Day when the parents will not be able to benefit the child nor the child the parent. Indeed, such tolerant and beneficent teachings are not to be found in any other religion.