betrayal is an essentailly positive action. it is an act, an unexpected act, reviled by the others because it is detrimental to them. for the doer, though, the betraying act is reaching out for something (s)he is deprived of, in hope of expansion. therefore it has an ethical defendability.
denial on the other hand, is the greater sin. denial erases an experience already savored from all time, all history, collective and individual.
it is an attempt to drill an infinite black hole in life, to make it unlived...
alas then... who is the bigger sinner? the one who betrayeth with a kiss; or the one who denieth thrice ere the cock croweth thrice?
faith is a thorny and thistly business, is it not?