Because Queen Elizabeth I was a Protestant, not a Catholic.
Queen Elizabeth the first ruled without a husband.
Anne Boleyn. Many say it was Elizabeth I, but the Boleyn family was a faithful protestant.
In 1559 Queen Elizabeth I re-established the Protestant Church in England; so1558-1603.
The reforms of the Church of England during the reign of Elizabeth I made it more Protestant.
Queen Mary of England. That's why we have the drink "bloody Mary".
Queen Elizabeth the I ruled with Parliment and on occasion she would rule against them if the situation called for it
Queen Elizabeth the first ordered the execution of Mary Queen of Scots. Mary was a Catholic and Elizabeth was protestant. Mary was a threat to Elizabeth for that reason and also because she was too close to the throne. (this answer can be massively expanded on)
Protestant
The church that Queen Elizabeth I formed was called Elizabethan Church and was of Protestant faith.
They were protestants because Queen Elizabeth I was a protestant.
Elizabeth I was never burnt. Her mother, Anne Boleyn, was the first queen executed. And Charles I was the first king executed. Mary I and many Catholics would have loved to get rid of Elizabeth as heretic as a Protestant or a plotter as heir to the throne but were unsuccessful.