Thanks for this. The thief on the cross example points out the simplicity of belief and that it doesn't require mastery of all the details provided in the Bible. But belief means accepting who Jesus is and that imply's obedience. Jesus' last words to his disciples included this command:

“All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to obey all things that I have commanded you; and lo, I am with you always, even to the end of the age.”

Jesus wants more than mere believers,
he wants disciples who will obey His teachings,
and therefore recursively make more desciples
who will obey His teachings.
The Bible is simply the best record we have
of what those teachings were.

With belief comes an ernest desire to know what Jesus wanted passed along.

Who ya gonna call?