Even if a person or two saw a talking snake and came to tell others about it, who would believe them?  Kind of answering the question with a question but I think it highlights the answer.  God works by miracles.  Things like, walking on water, being taken up alive in a world wind and flaming chariots, splitting large bodies of water to make a path for a million people to walk by… oh and flooding the whole earth.  We haven’t seen any of these things, but they are being told to us by witnesses in the Word. Do we believe it?  The Word only tells us Adam and Eve saw and spoke with the serpent.  I think it’s safe to say the rest of us just have to take it on faith.

Remember, the Most High never said His goal was to tap dance for everyone until they believe.  His Word shows us that He reveals Himself to a particular group, usually small, and uses that group to spread a message to the larger masses.  For example, Israel was called the smallest of all nations [Deuteronomy 7:7] but He revealed Himself only to them on Mt. Sinai.  Another example would be the Messiah, Himself, who was shown “not to all people” but a chosen few [Acts 10:40-41]. He is looking for those who will walk worthy of the calling based off of the Testimony that we have been given rather than each of us seeing the miracles for ourselves [John 20:29].