ما هي الطريقة الصحيحة للرد على المعتقد ببدعة معينة؟

A Muslim verifies what he denounces to see if it is an innovation (bid'ah). If it is confirmed in a specific person, he should explain to them, with gentleness and kindness, the words of the scholars and the texts from the Qur'an and Sunnah that refute their innovation, while also removing the misconceptions they use as arguments. If they are convinced, then that is excellent. If not, then the advisor has fulfilled his duty to Allah Almighty and established the proof, and has done what is required of him.