On the issue of whether Jesus existed or not, the late Maurice Casey’s ‘Jesus: Evidence and Argument or Mythicist Myths?’ might possibly be the book to go for.
Casey was, as far as I know, both a disinterested historian and a New Testament scholar. In other words, not a God squadder.
Yet he was firmly convinced that Jesus existed and wrote the book to demonstrate this.
It is one of many sitting on my bookshelf waiting to be read in retirement. However, given my age and the fact that I have high blood pressure, accounts of the ferocious onslaught that Covid-19 subjects its victims to that I have read about on here have made me think that I may possibly not live long enough to get around to it.
But anyway, the last time I looked online, Casey had been embroiled in some highly acrimonious spats with those of a more sceptical persuasion.
A bit of careful Googling may uncover the remnants of that.
My view is that Jesus did exist but getting at what he actually said and did is a nigh on impossible task because many of the Biblical sources have been heavily redacted by their authors (though the Pauline content may have something going for it), and I am not sure how trustworthy non-Christian sources like the Jewish historian Josephus are.