If you believe in the existence of an immortal soul, how do you explain its appearance to yourself? Where does it come from?
Based on the concept that the soul is immortal, it is logical to conclude that it existed before joining the body. Many people can say with confidence that after death the soul goes somewhere out there. But I haven't heard anyone explain where it came from. This suggests that the belief in an immortal soul is nothing more than speculation and credulity, and has nothing to do with reality.