Hindu Muslim marraige, how to convince our parents?

If you both become atheist and wants to marry each other then it would be convenient to convince your grandfather but when you have different faith/ethics/practices such as Islam and Hinduism which are pole apart and stands in total denail then you can not convince but tend to give up to get convinced by deceptive measures to be in a marriage by hook or crook which is condemned by the Islam and resented by the society and is not approved by your parents. Do you need the body of the woman you say you are in love with or do you really love and respect her. If you want her body then don't bring her religion into context as it doesn't approve at any cost the only option is left to you is conversion. Do you think you can leave your faith for a lady just to get her body for while or you want to do it for your love. In both cases sooner or later you will forced to come to your sense and revert to your faith. If you study Islam and then accept it for the religion it has to offer and not for the love or body of the woman in question then only this marraige can survive otherwise it will collapse. If she converts to Hindu without valuing the religion but for you then she may revert and will put your children in complex situation. If she remains in her faith and you on your faith such marraige is not recognised by her religion and is regarded as "Haraam" and children will br regarded illegitmate. On the top of it you are upseting your family and friends and the society as a whole. if you really love and respect each other. Think! Think!! very calmly and quietly. If you need you may take authentic people's verdict e who will agree to what i have mentioned. Explain the lady too many things are at the stake and mutually in a nice way call it a quits.