26.4. The Lord Jesus Christ is the Head of the church, in whom, by the appointment of the Father, all power for the calling, institution, order or government of the church, is invested in a supreme and sovereign manner; neither can the Pope of Rome in any sense be head thereof, but is that antichrist, that man of sin, and son of perdition, that exalteth himself in the church against Christ. 1689 LBC
The 1689 London Baptist Confession, in agreement with the Westminster makes no bones about it, the pope is antichrist. You may not agree but as Richard Baxter points out,
“That if the pope be not he, he had ill luck to be so like him.” (A Christian Directory Page 631)
In the preface or Translators to the Readers of the Authorized Version we find a reference to the pope as “that man of sin.” This is the Protestant position. The pope is recognized, at least historically, as antichrist. But it is not only a historic position, to recognized the false teaching of the Roman church, it is a biblical one. A position that Dispensationalist John MacArthur agrees with.
A free epub from a Historicist perspective for further study.