Gluten free diet. is this a fad? is there any point if you don't have celiac disease?

Yes & YES!!!: Yes, it is a fad, but for good reason. While less than 1% of those in the US have celiac disease, experts estimate ~10% have gluten sensitivity, distinct from celiac, which often causes GI symptoms, headaches & fatigue. Tests for celiac are negative so a trial of avoiding gluten is the best current test.

Food sensitivities: Some with GI distress feel better if they eliminate foods from their diet. Recently, the low-fodmaps diet is gaining traction for decreasing food hypersensitivity symptoms (these are not allergies!). Wheat based foods may be harder to digest, pull water into the gut, get fermented by bacteria and therefore increase gas in the gut. Stretch of the gut wall by fluids and gas cause GI symptoms.

Yes: Some people who don't have celiac do have gluten intolerance or gluten sensitivity. For them they are best avoiding gluten found in wheat, rye and barley. Celiac is a specific autoimmune disease to gluten. You can have a sensitivity or intolerance without being making autoimmune antibodies to it.