'Thou shalt not lie with mankind as with womankind; it is an abomination.'

This is what Fred Phelps put on the Matthew Shepard Memorial.

And along the same lines, Leviticus 20:13,22:

'And if a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination; they shall surely be put to death; their blood shall be upon them.'

What I would like to know is this: How do those people here who are Christians but who do not advocate the death penalty for homosexuals reconcile their own views with the fact that the Bible seems to say quite unambiguously that they should be put to death?