It is hard to believe in something we’ve never heard of, in someone we’ve never known. Can a 5 year old believe in algebra? Can we love, really love for life, a person we’ve never met?
Why do you believe in algebra, anyway?
Why do you believe that love exists?
Do you believe a butterfly can travel thousands of miles to a place it has never been?
If we creatures can’t even believe in other creatures without having heard, being taught, why would we not put at least as much effort into our education about God ?
"For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
"For the scripture saith, Whosoever believeth on him shall not be ashamed.
"How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?
"So then faith cometh by hearing, and hearing by the word of God."
Romans 10:10, 11, 14, 17 (King James Version)