You don't need to read philosophy to be a philosopher
It should be noted that the lines you quote from Kafka are half of aphorism #104, the last of the series titled
Reflections On Sin, Pain, Hope, And The True Way. The first half of #104 reads:
"No one can say we are wanting in faith. The mere fact of our living is itself inexhaustible in its proof of faith."
"You call that a proof of faith? But one simply cannot not live."
"In that very 'simply cannot' lies the insane power of faith; in that denial it embodies itself." — translated by Willa and Edna Muir
Each of the aphorisms (as noted by the translators) "were carefully written and numbered by Kafka himself on separate pieces of paper." In the context of what one needs to read or not regarding a subject of philosophy, Kafka, in this case, was intent upon tying the aphorisms together and read with the others kept in view.
So the confidence that the world will "give itself to us" in #104 has to be seen with the ease and depths of our capacity for illusion and harm. Consider, for example, aphorisms #25 and #26:
25: Once we have granted accommodation to the Evil One he no longer demands we should believe him.
26: The afterthoughts with which you justify your accommodation of the Evil One are not yours but those of the Evil One.
The animal snatches the whip from its master and whips itself so as to become master, and does not know all this is only a fantasy caused by a new knot in the master's whiplash.
Whatever "doing philosophy" may be, texts that strive to be more than a list of self-sufficient explanations need to live together in a certain way to become what they are talking about. I suppose one could look at that element in a purely instrumental fashion but there is more to it than that.