Historically Speaking.....

Some historical observations.

By accident mainly, and wrongly, in Ireland, Republicanism is linked to Roman Catholicism
(the Pope is a kind of Monarch of course) and ALSO - the FIRST Irish Republicans were Protestants;
and - now in Ireland, also by accident and wrongly, Protestantism is now strongly linked to loyalty to the Monarch.

[The Irish Roman Catholic fascists of the 1930s - the "Blueshirts" - were Monarchists].

In England, it is the other way around.
In England, Monarchism is linked to Roman or Anglo- Catholicism;
and Protestant Presbyterianism was once strongly linked to English Republicanism.
("the good old cause" as it was once known here in England).

In my opinion, true Christianity is best represented in all of this by Presbyterianism and Republicanism!
This would be "a priesthood of all believers" and secular, tolerant "commonwealth of equals".
a secular Republic!

http://republic.org.uk/
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Tony Benn (R.I.P.) was an expert on this kind of thing!