The family seem to have been Catholic because they married in a Catholic Church in Somerset and at least one of their children had a Catholic burial.
Just additional details from SP. Additonal RC records for them. Baptisms of some of the children:
Edwin ORGAN b. 6/12/1896, chr. 4/1/1897
Cairo, Military Vicariate
Military or outside Scotland
Cyril ORGAN b. 9/5/1900 chr. 28/5/1900
Shorncliffe, The Name of Jesus
Military or outside Scotland
Helen Mary ORGAN b. 10/12/1898 and chr. 30/12/1898
Aldershot, General Registry
Military or outside Scotland
Monica
PS: Doesn't help with burial details for Edwin Snr so far...