John 3:3 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
see - Grk. - eido I don't like quoting Strong's but in this case I will.
Strong 1492 eido
Meaning: 1) to see 1a) to perceive with the eyes 1b) to perceive by any of the senses 1c) to perceive, notice, discern, discover 1d) to see 1d1) i.e. to turn the eyes, the mind, the attention to anything 1d2) to pay attention, observe 1d3) to see about something 1d31) i.e. to ascertain what must be done about it 1d4) to inspect, examine 1d5) to look at, behold 1e) to experience any state or condition 1f) to see i.e. have an interview with, to visit 2) to know 2a) to know of anything 2b) to know, i.e. get knowledge of, understand, perceive 2b1) of any fact 2b2) the force and meaning of something which has definite meaning 2b3) to know how, to be skilled in 2c) to have regard for one, cherish, pay attention to (1Th. 5:12)
the word "see" in koine has the same idiomatic range as in English.
e.g. To say to someone "I see" not only says "I see the book" but "I see what you are saying" or "I understand what you are saying".
So in terms of perception of any kind - we cannot understand and/or find the kingdom of God in an unregenerate state.
BUT, I can entertain Van's idea because of the role of the Holy Spirit who convicts/reproves ALL individuals coming into this world - of sin.
ASV John 1:9 There was the true light, even the light which lighteth every man, coming into the world.
John 16
8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
9 Of sin, because they believe not on me;
Reproval/conviction of sin is where it seems to begin and that pre-regeneration.
HankD