The King and Parliament in particular were making it clear to non-conforming Catholics that a return of the Roman Catholic Church to England as the state religion was never going to be a possibility.
The plot to kill James was as much about him as it was about Parliament which if it had blown up would have killed the kings relatives, the Privy Counsel, the Protestant Aristocracy, all the Bishops of the Church of England and judges of the legal system.
In total the whole of the Protestant State.
The plotters intended to install the Kings daughter as a puppet Queen and return the Church to Rome.
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The short answer is that there was no "Catholic" plot to kill King James 1. It is no more correct to say this than it is to say that "Episcopals assassinated President Lincoln" (John Wilkes Booth was Episcopalian) The longer answer is that the assassination plot was due to (real or imagined) persecution. On November 5, 1605, a small group of fanatic Catholics in England led by Guy Fawkes planned to blow up the House of Parliament, killing the assembled leadership and assassinating King James I. When it had become clear that King James was not to grant Catholics any relief from the persecution of his predecessor, Queen Elizabeth I.
King James 1
she wanted to kill them because if they the did something wrong and disobeyed her they would get burned or beheaded.
Yes, James I of Scotland was Catholic, of course he lived in the 15th century, a hundred years before anyone even thought up the protestant heresy so all Christians were Catholics.
Guy fawkes was angry because all the catholics were treated unfairly, better than the protestants do they used the gunpowder plot to get rid of king James to make a catholic person king