The error of four crucified is not explained by fundamentalism. It's surprising that this actual error was invented by a man as educated as Bullinger. That he would point to an 18th century cemetery in France as supporting evidence is even more surprising for such a man, until you find out he was a fervent flat earther. Then, it's, "Ohhhhhh..."
It's surprising that a scholar as proficient in languages as Bullinger would fail so profoundly to understand how translation works and why word for word literal translations of idiomatic expressions like ἐντεῦθεν καὶ ἐντεῦθεν are ineffectual. The word "one" wasn't added in the way it is suggested. It is not a corrupt interpolation motivated by some nefarious agenda. Translators add words sometimes so an expression in the source language will make sense in the target language. This is not a radical idea.
That Bullinger pretended not to understand ἐντεῦθεν is an adverb modifying the verb crucified and answering the question "Where?" is beyond astonishing. It does not modify "two." That Bullinger defecates on all that he should know about Greek and English is suspect. Who now has the nefarious agenda? Why would he invent such deception?
Four crucified is so blatantly inaccurate and irresponsible that, for me, it calls into question everything Bullinger wrote. I'm not saying Bullinger was wrong about everything, just that everything he wrote deserves scrutiny.