Hmmm. Apparently the big evolutionary players, like TalkOrigins and Nova, don’t agree with you. They believe Common Descent is absolutely the realm of science and anyone questioning their right to this claim are “religionists” trying to jam out-dated dogma down the public’s throat.
Check out your compatriots.
http://www.talkorigins.org/origins/faqs-evolution.html
Common descent is science. Abiogenesis (studying how life might have originated) is also science. They are not the same field of science, however.
Steak is food.
Pizza is food.
They are not the same food.
OK?