I have scoliosis. Is it safe to do push ups?

Yes. Pushups should be safe with scoliosis. There are multiple types and reasons that people develop scoliosis. Push ups should be avoided if the exercise causes any severe increase in back pain or any numbness, tingling, weakness in the extremities. It is often beneficial to develop an exercise program with a physical therapist or personal trainer prior to starting a comprehensive exercise program.
Yes. Push ups and other exercises do not affect scoliosis. In general exercise helps people strengthen the muscles and bones, burns calories, relief stress. Exercise done properly has many benefits. If you are not "in shape" start slowly and add intensity. If a certain exercise is uncomfortable or always bothers you, try a different exercise.