With the antideluvians God had Noah produce something physical “the Ark” and then God spoke to the people through Noah and said – Now you need to make a choice based on what you have seen. In like manner God has also done this for people living in the end times. He has produced physical evidences such as Sodom and Gomorrah, the Red Sea Crossing and the Garden Tomb. And even more astoundingly God has preserved these evidences for thousands of years. Just as it says in Romans – these things that God has made are clearly seen so there won’t be any excuse for people if they choose not to believe them.