In my opinion God did miracles back then to reveal himself more prominently to the human race knowing very well that people would have the opportunity to read them later are a reference point. God has dealt with the generations distinctly throughout biblical times. And the last time He biblically revealed himself was through His son ( God made in the image of flesh. The reason he is called the son is because he is directly of God and not created by God). In my opinion he doesnt reveal himself now is because we have his words to read. Many accounts of Gods direct interaction with mankind. It even said in the bible that the Israelites were used by God as an example for later times, as seen in one of Pauls letters. Paul and the apostles weren’t interacted by God in the same way as the Old Testament as we also arent interacted by God as in the prior. Thus the reason for trusting in what has been written. I also think we don’t see any literal interaction these days is that we wouldn’t even notice it in the first place. Being so distracted with our devices and lives and so on. And we are in such a superficial state that we wouldnt ever recognize Gods interaction as God therefore modern man thinks “what God?” We as mankind have grown so egotistical in our world views and have made such leaps and bounds that we even question if we need a God at all. Swimming in our own intellect. We all trouble with this to some extent or another