Well…since you asked …
Thomas Aquinas (sp?), St John of the Cross, Mother Teresa, St. Augustine, etc. all expressed doubts of the existence of God. None of them had any personal visitations from resurected beings that I’m aware of.
We are so fortunate, IMHO, to live in the last dispensation where all that is cleared up.
I think there is a profound difference between doubt (which we all have) and disbelief.
I don’t think you’ll find Joseph Smith expressing any doubts.
Just my 2 cents….
Mileage may vary.