The statement that there are no gatekeepers is at variance with many traditions, in particular that of ancient Egypt, and also Christianity, in which Christ himslef is represenetative of the gate (of 'Heaven')
Basically the Deities that guard such gates need to be satisified that the individual has held to the spiritual principles which they personify, and thus passage through is conditional.
Such gates are the entrance into the realm of the Eternal afterlife of course, it should however be noted the traditions of two sets of gates opposite in function, as in the Gates of Heaven and those of Hell, the latter leading to the negation of the individual.
From Sumeria one finds the Gate of the Scorpion and that of the Bull, both having stellar locations and differant mythological connotations, or from Greece at a later date the tradition of the two gates of 'dream'
Two gates the silent house of Sleep adorn;
Of polish'd ivory this, that of transparent horn:
True visions thro' transparent horn arise;
Thro' polish'd ivory pass deluding lies.
Of various things discoursing as he pass'd,
Anchises hither bends his steps at last.
Then, thro' the gate of iv'ry, he dismiss'd
His valiant offspring and divining guest
Stranger, dreams verily are baffling and unclear of meaning, and in no wise do they find fulfilment in all things for men. For two are the gates of shadowy dreams, and one is fashioned of horn and one of ivory. Those dreams that pass through the gate of sawn ivory deceive men, bringing words that find no fulfilment. But those that come forth through the gate of polished horn bring true issues to pass, when any mortal sees them. But in my case it was not from thence, methinks, that my strange dream came
The portal that leads to the negation of self not surprisingly requires no conditions of entrance or passage, and is accesible to all, and will be associate with all falsehoods and delusion, essentialy the principle is that of deconstructivism of what constitutes the life of the individual.