Summarize:

If you must hide your relationship because of a difference in values -- whether religious or cultural -- seek the help of people who have been in similar situations. Bide time to help your parents and/or partner adjust to the situation. By surrounding yourself with caring and respectful people, you can rise above your parents’ closed-mindedness if they are unwilling to change. Assure your partner that they are cared for and that you don’t agree with your parents but don’t want to lose your relationship with them. Build his confidence that your parents' opinions won’t hurt your relationship. Let him know that he is more important than your parent’s approval and that the secrecy is temporary. You don’t need to put a time limit, but it can be expected that your partner may give you an ultimatum. No one wants to be in a relationship that their partner is ashamed to be in. Be prepared to choose between telling your parents or losing your partner. This isn’t about who is right or wrong, this is about how you define family and your own values. Everyone will have to learn to respect and accept one another if you want to have them in your life. Be strong in your own values and communicate respectfully that you are unwilling to compromise that. Hiding your relationship should not be permanent. It may take time for your parents to realize that only you know what’s best for you.  If it means losing your parents, that is for them to decide. Being true to yourself is what's most important for your mental, emotional and physical health.
Surround yourself with supportive people. Support your partner. Don’t take a side.