Or...it's simply that God gave us physcial faculties to look at the mechanics of the universe, and then conduct introspection on what we have seen as we internalize it. Introspection is based on external knowledge; therefore, if your "learned" wisdom is wrong, your introspection will be wrong. Since as Christians we start with the Bible, our learned wisdom is that of God, whereby we then attempt to make sense out of what we see. Introspection doesn't just spring into being; it must be triggered by external knowledge being internalized.
This method has worked for countless scientists like Neils Bohr, Isaac Newton, and Einstein himself, as well as David Bohm, Thomas Townsend Brown and Nikola Tesla.
None of that discounts the existence of the supernatural or the existence of the Gifts of the Spirit, or why there is a lack of such objective experiences. And what do I mean by a lack of objective experiences? I am reminded of the dozens of people who gather in UFO hotspots to watch as lights dance about the sky in a way that violates are deepest understanding of physics. That is objective and undeniable. It is on the same level as Jesus walking across water in front of thousands of people gathered on the shore of Galilee. Those are the supernatural gifts we no longer see--unless you've seen someone walking on water and you're just not telling us...?
Such a day is coming, however, when we're all going to see signs that are objectively and undeniably supernatural, but that still doesn't mean it cannot be explained by science; it just cannot be explained by our current understanding of science. God's mathematics and formulae used to create the universe are bound to be so incomprehensible to us that it sounds like foolishness, but His truth is undeniable. I was created by God with the curiosity and love of discovery specifically so that I could gloriy God each time more is revealed to me through my five senses and interpreted through the wisdom of the Word, and I love learning new things about the universe because it is endlessly fascinating to me.
I'm sure the reason why we don't see more objectively supernatural gifts is multi-faceted because that's how all of nature operates. The leaf doesn't just provide chlorophyll, it provides shade for the roots, food for bugs, fertilizer for the soil, and oxygen to the phloem, and likely dozens of more benefits as well. Therefore, God must also have multiple reasons for doing what He does in His own time that are beyond our immediate understanding. God, being a master engineer, would strive for efficiency in energy transfer--getting the most done with the least amount of effort, despite being omnipotent. Just because one is omnipotent doesn't mean one is a profligate expender of energy. We are created in the image of God, and it is likely that just as we like to get the most bang for our buck out of every moment of the day, God likely does, too, and that's where we get it from. So the reason we don't see supernatural gifts any more is likely for a variety of reasons, not simply because the Holy Spirit no longer needs to manifest thusly, and we'll have to wait for the reason until He deigns to tell us (and He will in time because God is not the author of confusion). All things work towards the good will of God.
Now, if you can show me anything unbiblical in the above, I will gladly seek understanding and correction. However, this is what I have been able to deduce in the course of my life, and I'm humbly glad to be able to say, I'm not finished learning yet because the majesty of God is infinite.
Edit: Being born again is an internal, and entirely subjective experience. Otherwise, please post the video of someone being baptized and something supernatural occuring. Yes, it's a miracle to the one receiving it, but it's not like calling down fire from heaven to torch the Baal priests' altar.