What religion are alex filippenko and neil degrasse tyson?

are alex filippenko and neil degrasse tyson christian or athiest?

Alex Filippenko website: http://astro.berkeley.edu/~alex/

Neil Degrasse Tyson info:

Neither an atheist nor religious, Tyson's views on spirituality are complex, and are best understood from his two essays 'The Perimeter of Ignorance'[3] and 'Holy Wars'[4] both appearing in Natural History Magazine. From the 2006 Beyond Belief [5] workshop on Science and Religion, see excerpts from Tyson's talk on unintelligent design in the universe[6] and the spirituality of science itself.

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