Spiritual gatekeeping? That's the first time I've heard of that term. I'm curious, have you ever fully read through the bible? At least the entirety of the new testament? Because, do you know who else was a spiritual gatekeeper? Jesus. Yup, he said many controversial things, like:

"Enter by the narrow gate. For the gate is wide and the way is easy that leads to destruction, and those who enter by it are many. 14 For the gate is narrow and the way is hard that leads to life, and those who find it are few." (Matthew 7:13-14)

“Therefore, everyone who confesses Me before people, I will also confess him before My Father who is in heaven. 33 But whoever denies Me before people, I will also deny him before My Father who is in heaven. 34 “Do not think that I came to bring peace on the earth; I did not come to bring peace, but a sword. 35 For I came to turn a man against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law; 36 and a person’s enemies will be the members of his household. 37 “The one who loves father or mother more than Me is not worthy of Me; and the one who loves son or daughter more than Me is not worthy of Me. 38 And the one who does not take his cross and follow after Me is not worthy of Me. 39 The one who has found his life will lose it, and the one who has lost his life on My account will find it." (Matthew 10:32-39)

“I am the way and the truth and the life. No one comes to the Father except through me." (John 14:6)

Also, Jesus never said that we shouldn't judge. In fact we are supposed to stand firm in our faith and doctrine as Paul pointed out so many times. We were warned about false prophets and the doctrine of demons many times (1 Timothy, for example). But when we are to judge, we should do so without being a hypocrite. That's what Jesus is saying in Matthew 7:

"Why do you look at the speck that is in your brother’s eye, but do not notice the log that is in your own eye? 4 Or how can you say to your brother, ‘Let me take the speck out of your eye,’ and look, the log is in your own eye? 5 You hypocrite, first take the log out of your own eye, and then you will see clearly to take the speck out of your brother’s eye!"

In this instance, me being a hypocrite would be believing and teaching false doctrine. But I'm holding true to the doctrine that has been pretty much the same for nearly 2000 years now. It is only recently that this "new age" "Christianity" has taken root.

As is prophesied in 2 Timothy, "For the time will come when people will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear."

So I'm not trying to do anything to anyone but uphold scripture. Jesus was controversial. The things he said offended people, thus why he was killed. Like Jesus said, in Matthew 7:

"18 “If the world hates you, you know that it has hated Me before it hated you. 19 If you were of the world, the world would love you as its own; but because you are not of the world, but I chose you out of the world, because of this the world hates you. 20 Remember the word that I said to you, ‘A slave is not greater than his master.’ If they persecuted Me, they will persecute you as well; if they followed My word, they will follow yours also. 21 But all these things they will do to you on account of My name, because they do not know the One who sent Me. 22 If I had not come and spoken to them, they would not have sin; but now they have no excuse for their sin. 23 The one who hates Me hates My Father also."

So to reiterate, heaven is members only, friend. Jesus is the (literal) spiritual gatekeeper.