Sure, give your argument, that's what this thread is for.
Most of those here who are interested in the historical Jesus have already heard my arguments, and I consider it a terrible sin to bore people.
But since you've asked.
GMatthew and GLuke I consider absolutely worthless as accounts of Jesus since both of them are apparently just revisions of gMark. Real revisions, in the manner that fiction is revised. In today's world, they couldn't even be published. Mark would sue them for plagiarism.
GJohn is worthless as an account of Jesus. Over the top theologically and written some hundred years after the purported events. No more use than the Book of Mormon so far as helping us know about the historical Jesus.
No other extra-biblical evidence for Jesus seems the least bit compelling to me. I have to watch people quote historians who lived tens and hundreds of years after the events, as if 'ancient' historians carry some weight which is not carried by an historian who writes today about Jesus.
So there's only gMark. And gMark seems like fiction to me. It's in the category of drama-too-good-to-be-true. Stuff like that just doesn't happen in real life, in my experience. It only happens in the imagination of a fiction writer. And it was obviously written for theological purposes... like the Book of Mormon. I don't trust stories with godmen in them, no more than I would trust a super-hero comic book.
Steeltoes has just mentioned how Mark obviously 'borrowed' elements of his Jesus Story from the old Jewish scriptures. Again, that looks to me like story construction, not like history recitation. All of it looks like fiction to me. And I think that we are just too close to it to see that. I wonder how many Chinese, upon reading gMark for the first time, would entertain the least thought that it is anything other than an old hero story, like Beowulf.
Then there's the timing. Since Jesus made no discernable mark on the secular consciousness of that time and place, we must assume that he was, well... unremarkable.
So how could Paul be persecuting Christians -- even in distant, foreign cities -- within a couple of years of 30 CE? Why would Jesus churches spead far and wide like that in less than five years?
How could Paul be writing to established churches in Asia Minor, about doctrinal issues, so soon after this unremarkable man died?
My guess is that proto-Christianity existed in Jerusalem maybe 50 years before the time of Jesus.
And what about Paul, who seemed to know nothing of Jesus? They were contemporaries. Paul had the opportunity to meet with Peter, whom he surely would have pumped for info about Jesus. Yet Paul seems oblivious to a Jesus who lived in his own time.
That should get us started. There's more.