Right.
I see is a little differently than that.
There are ages.
There was no "Bible" that we know of between Adam and the flood, although my personal opinion is that some of the beginning of the book of Genesis were written during that time and handed down the family line. That's up for debate though.
The people living then lived unusually long lives so the overlapping of generations was nothing like we have today. People could have sought out Adam for hundreds of years to hear directly from his mouth that God had created him and his wife and that all the troubles in the world were a result of their disobedience. The "godly line" leading up to Noah was not far removed from Adam and held firm to their belief in God. It doesn't seem like very many people were interested however, since the New Testament refers to Noah as being a preacher of righteousness yet only Noah and his family were kept alive in the ark. Did Noah warn others of the coming flood and beg them to repent towards God and believe God's words and come with him and his family? It's speculation, but I think it probably did happen that way.
See the overlapping of the lifespans:
https://www.conformingtojesus.com/images/webpages/chronology_chart_from_adam_to_abraham_1.jpg
After Noah and the flood people had immediate access to Noah and his descendants up until the time of Abraham, since Abraham lived at the same time as Shem, Noah's son. I think Shem was likely Melchizedek who met up with Abraham at least once, but there is some uncertainty as to who he is.
Then as people continued to turn from the knowledge of God and obedience to Him, God began to focus on Abraham and his descendants.
Eventually the Israelites were given the Scriptures, but the message of God was available at all times somewhere on this earth before then. It was people who chose to turn from the truth and this often affected the truth that their children came to know. However, that does not stop God from seeking out people or bringing them into relationship with Himself.
Last we have the age of the Christians who have been tasked with testifying to God's work in their lives that began when they trusted in Jesus as their Lord and Savior.
God put what He wanted us to know into the Bible. There is no need for the miraculous.
Another way to think of it is that during this time God wants people to seek and find Him without being forced to. There will come a time when the miraculous will happen again and God will return to earth to reign and there will be no question that He is God. However, knowing this is true does NOT lead everyone to want Him in a personal relationship, to save them from their sin and yield themselves to Him and find mercy through the blood of Jesus.
So, there are different ages where God worked in different ways at different times to call people to repentance and try to turn them to Himself. You guys on this thread have been nice to me and the other Christians here, relatively speaking. The prophets in the Old Testament were often put to death and Christians have suffered a lot of persecution for the last 2,000 years primarily because the message of we share goes against what people want to hear.
In the end, it will be seen that no matter how much "evidence" was available to people, the majority of people will choose to go their own way instead of submitting to the truths they do know about God.
I have stretched out My hands all day long to a rebellious people, Who walk in a way that is not good, According to their own thoughts..
Isaiah 65:2 NKJV
He who believes in the Son has everlasting life; and he who does not believe the Son shall not see life, but the wrath of God abides on him.”
John 3:36 NKJV
Seek the Lord while He may be found,
Call upon Him while He is near.
Let the wicked forsake his way,
And the unrighteous man his thoughts;
Let him return to the Lord,
And He will have mercy on him;
And to our God,
For He will abundantly pardon.
Isaiah 56:6, 7 NKJV
Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it.
Matthew 7:13 NKJV
All in good fun Good1