The Textus Receptus was written by the Roman Catholic priest Erasmus.
Not all of it.
And let's not pretend Erasmus was the typical papist. He was a seeker of truth. He sought to EXPOSE the errors of papal Western Family MSS. In 1516, he published a revolutionary Bible format which had on each page both the Greek
and the Latin, the one facing the other, so that comparisons of the two could easily be made.
He said blasphemously, "Latin scholarship, however elaborate, is maimed and reduced by half without Greek. For whereas we Latins have but a few small streams, a few muddy pools, the Greek possess crystal clear springs and rivers that run with gold."
Erasmus said the Vulgate was so corrupt, he published a new Latin translation based on the Greek. When he published his dual language Bible, the corrupted Latin was on full display.
Such words would have easily earned someone a trip to the stake. For instance, the Greek says, "Except ye
repent, ye shall all likewise perish" but the corrupted Latin said, "Unless you do
penance, ye shall all likewise perish" - salvation by works.