Accept/acknowledge (using empirical, rational, testimonial, logical evidence based on a strong epistemological approach) the existence of our Creator who gave us life, rationality, objective morality, and accept the message of all the Prophets that came only to remind us of our innate disposition to believe in God (who deserves praise and worship regardless if we existed or not).
And then recite:
“Ashh Hadu anLa ilaha illAllah wa ash hadu anna MuhammadanrRasool Allah” which means:
“I bear witness that there is no god worthy of worship except Allah and I bear witness that Muhammad is His last and final messenger”.
You will be then considered a “Muslim” (the person or thing that submits to God).
Now you would be regarded as someone who has come to terms with the Creator of the universe to Whom the entire universe is in submission except for the will of humans.
Humans have been endowed this ability to choose belief vs disbelief.
Read the Qur’an for yourself and don’t let the society or media socialize you into thinking what the Qur’an says.