as an agnostic I can say, I believe there is an ultimate reality with a true nature and that I have found no way to tell what that is...and dont believe anyone else has either...and that is honest.
I have met plenty who claim to KNOW that God is real....how? by faith! they tell me... to which I respond that is not knowledge, that is pretending to know what you only believe....or lying.
a true man of faith can be an agnostic, ie, honest.
you can have FAITH in God without pretending to KNOW you are right.
your experience of God does not mean it WAS God...the experience was REAL but your belief about it does not follow just because you have a FEELING of certainty and another belief that this feeling could not be wrong.