His official death certificate lists a 20 year difference in his birth year? That's amazing. Keep in mind that the person most knowledgeable would not have been giving the information for a death certificate - 'Christ' would be dead and would be the subject someone else was giving information about - and the person giving the info would possibly have been quite upset. We can be sure he couldn't have had the same birth year as any son of his ....
When first I searched for Christ or Christian Hegdahl - I followed the information you had given (allowing for the Norwegian spelling preferences for these names starting with K instead of C, etc) - and ignored the few Christopher/Kristopher/Kristoffer given names which I remember did pop up.
Which census said he emigrated in 1800?
Maybe reading this will help you understand why I was trying to add more identifying information for your original query -http://www.rootsweb.com/~wgnorway/good-queries.htm