The Ornithologist: An interguing film, but what's it all about - if one may ask

Portuguese director Joao Pablo Rodrigues's 2017 film, The Ornithologist, is visually stunning - not just the shots of birds, though those are great as well - mysterious, and engaging, up to a point. It's definitely not a movie for anyone who likes everything in a film to tie together and to "make sense." This is a film of puzzles and enigmas, and though many segments of the film may be subject to interpretation others I think intentionally defy interpretation. They're "real" because we see them on film; whether they mean anything at all is another matter. The film, briefly, involves the eponymous ornithologist, Fernando, who sets off in a kayak on a river in what we later learn is part of a pilgrim's trail in NW Spain. At the outset, ominously, he receives a message reminding him to take his meds. Shortly into his bird-watching jaunt he gets swept away in a current, loses pretty much everything, including his pills - so is all that follows his hallucination? Rodrigues doean't give into the movie cliche of dreams and visions; everything is photographed with a "realistic" lens. Strange things begin to happen to Fernando, including some episodes that seem impossible if taken literally (e.g., two female Chinese pilgrims tie F up in the night so that he can barely move let alone escape; how could they do this?). I won't give away crucial information, but will only note that there are many religious overtones, especially involving the crucifixion, and a completely puzzling (to me) closing sequence that may suggest the successful completion of a pilgrimage or rite of passage. To me, this kind of narrative would never work in fiction/in print - we wouldn't buy the events for a second - but when we "see" these events quite literally before our eyes we're much more credulous, we're drawn in. The question is: Into what? Was there a point to this journey? If so, it eluded me.