There is an awful lot of utter trash being circulated online and off about Göbekli Tepe, as every historical conspiracist under the sun races to claim it proves their particular point. However, it is an ancient site with very unusual features. What do actual historians make of it?
Technically, a historian would not study Gobekli Tepe as it does not fit into the time frame of history. Historians study societies which left behind their own written records, which is why the study of history falls within the realm of humanities. Gobekli Tepe was built 6,000 years before the first writing system in the world was invented, which means that only scientists (specifically anthropologists such as archaeologists) would study it.
As for the mainstream scholarly consensus (that of archaeologists, not historians), very little is understood about the site, which is why it is so easy for people to speculate. It's difficult to prove a wild, speculative theory to be wrong when no one really knows what the right answer is. Klaus Schmidt, the German archaeologist who led the excavations there for nearly 20 years until his death in 2014, concluded the site to be a massive temple complex, the oldest layer of which dates back to around 9,500 BCE. He also identified it as being the center of a widepread cult in the region, as much smaller sites with similar cult structures from roughly the same time period have been found at other sites not far away, such as Nevali Cori and Karahan Tepe.
Another interesting theory of Schmidt's was his claim that Gobekli Tepe demonstrates that the need for building and maintaining temples was the reason why humans started to come together and live in communities. In other words, people didn't start living together in cities and then decide to build temples in their cities. According to Schmidt, the opposite happened--people built temples, and then decided to build cities (in the primitive sense at first) to be near their temples. (see Klaus Schmidt's book, Gobekli Tepe: A Stone Age Sanctuary in South-Eastern Anatolian, 3rd ed., Trans. Mirco Wittwar, Munich: C.H. Beck, 2007 -- this is an English translation of the book he wrote in German entitled 'Sie bauten die ersten Tempel' ['They built the first temple'])
Since Schmidt's passing, the first human remains were found at the site. A few fragments of human skulls were found, and they showed evidence that they had been carved with tools and painted. As a result, archaeologists have concluded that some kind of skull cult existed at the site, and one of their practices was to display decorated severed heads in their temples (see Jason Urbanus, "Skull Cult at Gobekli Tepe" in Archaeology, Jan/Feb 2018, p. 27).
Unfortunately, not much else is known about the people who built the site and why they built it. There is only so much we can really know about a temple built 6,000 years before the invention of writing. And so speculators are going to speculate.