conon394,
When a person is born again of the Spirit of God the Faith that brings them to that belief is that of Jesus Christ which is imputed to them that they do believe. So, what is that Faith? The answer goes back to what Jesus asked the disciples Who they thought He was, the answer being that, " You are the Christ, the Son of the Living God..." and on which Jesus told them that, " ...on this Rock I will build My Church." and that they would have the keys to it. Those keys were then and are now the preaching of the Gospel of Jesus Christ, how? Because we are told that the Gospel is the Power of God unto Salvation. So, whatever feelings or faith a person has they are not the same as that imputed to new believers by the Lord Jesus Christ at their rebirth. There is only One God, one Saviour Jesus Christ and one Holy Spirit of God and it is His Gospel that can save anyone, meaning all others are false.
So, notice that throughout the Bible God has this habit of repeating Himself to confirm the veracity of His Word. Mathew and John were Jews whereas Mark and Luke were not so here again is that double confirmation by double witnessing by God to all peoples that His Word can be relied upon whatever the situation. The events of Pentecost came some fifty days after Jesus had been raised to Glory leaving them with instructions on what to do when that Feast arrived. They preached the Gospel and some three thousand were saved that day and more even after that. Of course Luke and Mark weren't there although as Mark's mother was a follower of Jesus it is possible that he was the point being that as these converted peoples returned to their lands written Word of what they now believed was sent to them to encourage and confirm their new lives in Christ. So to say that the writings were not done for many years after is not altogether factual.
Concerning Paul, a man taught by Gamaliel, the great teacher of Jewish Law, became feared because of his enemity to the Christian doctrine until that is God put him on his knees to convert him. Once converted he began preaching the same Gospel in places where it had not been preached and confirming it where it had. In other words he preached in places where churches had long been established as well as new places. His chief concern then was that some Jewish converts were still stuck to the Law and he had to convince them that this was no longer the case. That is why his letters are so important a part of the Bible.
When we come to the life of creation I am no expert on this but I will say that numbers have an important position with God and so if we are but six thousand plus years old and the signs pointing to Jesus's return are there then the year seven thousand looms up in prominance, why? It is prominant because God made us in six days and on the seventh He rested. Six is man's number which stops short at that but why? Because he fell short of gaining God's rest by falling into sin. That is why the evil trinity is numbered 666 because it was condemned on the same day. Am I correct? I don't know because it is all in God's perfect timing as His numbers have proved throughout His Word, the Bible.
Now concerning the Ark I think it is plain to see that modern shipping specifically container vessels can endure vast journeys no problem yet all the Ark had to do was stay afloat without any vast journey which it did and why? Because it was pitched inside and out to seal it plus having the overlooking of God to keep it safe exactly as God intended. Every detail of that was exacted by God and if He like He did with Adam to make Eve why couldn't He do the same with the animals on board? We don't know but what we do know is that every creature on board disembarked when Noah opened the door. Male and female of each kind did what they have always done and that's why I have had in my home two German Shepherds, one black and tan and the other long haired sable, one Belgian Malenois and two smashing Huskies.