Kierkegaard would not find anything strainge about today's form of existenitilism. In fact he suspeccted it would occur.
S.K. understood the nature of human existance. He also understood the logic humans use to justify to them selves their reason foe existance.
Pascal's introduction of self "I think, therefore I am" creates this dicotomy between logic and existance. S.K. tried to show that there is no need for this dicotomy to exist. What S.K. tried to show was that humans had taken existance and logic within themselves and that, this creates the dicotomy. But, that one could [Through a leap of faith] move existance outside of oneself and from here the dicotomy does not exist.
A clear understanding of this is; "Are you outside of the mirror looking in? Or inside the mirror looking out?"
S.K.'s lifestyle and his belief that true existance was from within the mirror, and from here the dicotomy of logic and existance does not exist.
The question is, how to get there?