Three different IGI sources give three different dates for this marriage: 1773, 1778, and 1786. Based on what I believe to be daughter Susannah's correct birth year (1776), I assume the 1773 date is the most likely. Also, the children listed for this marriage span 35 years, which is most unlikely. Some of these children may be grandchildren of Christian and Christiana. More research needs to be done.
Pictorial History of the Virginia Conference, David Franklin Glovier, 1965, page 26, says Henry was a twin brother of Christian. Of the four birth dates found, do not know which is correct 1780, 1787, 1790, or 1799.