The following two ideas that I had learned some 25 years ago from Rabbi Saadia Gaon’s Philosophical work the “Book of Beliefs & Opinions” (circa 6th or 7th Century) had inspired my faith in moments of doubt:
A) Addressing those who question whether the world has a Creator, Rabbi Saadia wrote that if the world created itself before it existed, it was not yet present to create itself. On the other hand, if the world created itself after it already came into existence, what’s the point in creating what already exists? Since either way the world couldn't create itself, it has to have a Creator.
B) Addressing those who question the belief in a soul, Rabbi Saadia wrote that nothing can give what it can't access. One who denies the existence of a soul is really claiming that non-consciousness gave rise to consciousness. Since non-consciousness can’t access consciousness, it can't make a being conscious. Therefore, the source of consciousness has to be elsewhere, i.e. a soul.