This is the full list of bapts for the children of Edward Christian and Jane Quayle, transcribed by Tom Corteen from the Maughold parish register volume:

CHRISTIAN William Edward [son of] Edward Christian/ Jane Quayle Parish Church 4 Aug 1853
CHRISTIAN John Edward Christian/ Jane Quayle Parish Church 26 Aug 1855
CHRISTIAN Alexander Sayle Edward Christian/ Jane Quayle Parish Church 27 Sep 1857
CHRISTIAN Thomas Quayle Edward Christian/ Jane Quayle Parish Church 25 Sep 1859
CHRISTIAN Robert Henry Edward Christian/ Jane Quayle Parish Church 1 Jan 1862
CHRISTIAN Ann Jane Edward Christian/ Jane Quayle Parish Church 15 Oct 1863
CHRISTIAN Elinor Margaret Edward Christian/ Jane Quayle Parish Church 25 Dec 1865
CHRISTIAN Catherine Maria Edward Christian/ Jane Quayle Parish Church 19 Jun 1868
CHRISTIAN Jane Elizabeth Edward Christian/ Jane Quayle Parish Church 21 Aug 1870.

I think it is pretty clear that John Thomas isn't there, but Thomas Quayle is.

Possibly the Thomas Christian aged 21, ship steward, b. IOM appearing in Lancs in the 1881 census.

Will email you again.

Sue