we are born muslims, we are all born after we have already witnessed to Gods oneness and him being wali, the last prophet(SAWS) being the seal of the prophets and a wali, and as well the wilayat of Imam Ali(عليه السلام). however we are born on earth as a test for our sincerity to this truth. those who only say it on their tongues yet believe otherwise in their hearts vs. those who say it and believe it in their hearts. God wants to bring out those in hiding into the open. the only one who is Hidden is Allah(سُبْحَانَهُ وَ تَعَالَى). that is why shaytans story is so relevant and the first thing you read and learn in the Quran