This is touching on the subject of the OP...so I would add in that knowing God directly is the narrow way. Walking in His ways according to His power. Very few will do that.
But salvation is also at a lower standard than that. A standard that all men can attain to IF they but humble themselves. To do as we ought is equivalent to knowing Him since if we knew Him we would do this at the very least.
Jer. 22:15-6
Shalt thou reign, because thou closest thyself in cedar? did not thy father eat and drink, and do judgment and justice, and then it was well with him?
He judged the cause of the poor and needy; then it was well with him: was not this to know me? saith the LORD.
Acts 10:35 But in every nation he that feareth him, and worketh righteousness, is accepted with him.
Sorry I missed your proposition of salvation being a many standard thing.
Paul talked of one salvation and being in the Kingdom, either you were in His people or you were not.
Jesus talked that if you wanted to be great in the Kingdom you had to be a servant to others. So Jesus took up the bowl and towel and washed His disciples feet. And He said likewise we should serve one another. Now depth of our walk in Christ is closer to Him, but the idea of layers is not in scripture. Peter talked about making our calling sure, so we knew who we were and where are assurance is placed.
I do fear that some feel visits to spiritual realms deem greater authority or insight than actually being like Jesus and putting into action love from the heart. So many have become seduced by this other realm, it leads me to believe in the most part it is deception and trinkets.
I remember having one preacher lay hands on me, and expected me to be slain in the spirit. I was not, which in some ways suggests he was not exercising power. Or getting "drunk" in the spirit, or holy laughter or any number of signs, which demonstrate God is present.
Sadly all believers are indwelt by the Holy Spirit so He is there all the time wherever they meet.
Some churches want gold dust, jewels, golden crowns on their teeth, feathers etc. to authenticate their spiritual authority.
And of course this second tier super apostles you have to submit to, because they have the hot line to God.
Now true enough a prophet speaks Gods word to the people who need it. But a messenger carries a heavy burden and often does not agree with the message, like Jonah, which does not end well for them. So a lot of people aspire to something they should probably fear, and have no clue what happens to Gods messengers on the whole. A short trip to heaven is not that unusual. God bless you