There's a civil reg. for a marriage (Thomas Gordon) in the reg. dist. of Dundalk 1907
Jan./Mar.1907 Dundalk registration district volume 2 page 659
Thomas Gordon
Emma Elizabeth J.K. McCredy
This is more likely to be the correct marriage:
July/Sept.1902 Belfast registration district volume 1 page 408
Thomas Gordon, son of Hugh
Lillie Rodgers* (Lillian, daughter of Joseph according to one source but Lillie is probably correct)
* Lillie is often a nickname for Elizabeth and remember that 1911 census gives Elizabeth's birthplace as Co.Down