Thank you so much, all who responded.
First of all, I really apologize to all of you whom I impresed as totalitarian. That was not my intention. Probably when I write about evolution, I - against my will - acquire a certain harshness in my tone because of so many problems with my students that I encounter daily. There is this persistent and pervasive belief among them that I say things that I say because I, like other science teachers, kind of, belong to a particular anti-theist, anti-Christian "gang." By my nature, I am not a terribly strong logician and debator, I feel my weakness and become defensive. Sorry about that.
Of course I do realize that the nature of science is questioning everything. When I asked, are scientific thruths "up for grabs," I never meant that these truths are carved in stone for ever and ever. My question was more, can an individual decide that he/she believes or not believes in the discoveries made by scientists based on that individual's belief systems? Can I decide that I do not believe in the existence of, say, neutrinos because I am a Buddhist or Muslim or Zoroastrian?
It is this focus of the problem that actually bothers me a lot, exactly because I keep hearing it all the time from Christians - that yes, we can, and we should, "choose our position" on the theory of biological evolution because we are Bible-believing folk, and the Bible says in this chapter and this verse that there was an actual physical time when ONE human being existed and lapsed into sin, etc. etc. etc. (in the case of Orthodox, to this is added this and that interpretation by this or that Holy Father). So, if you "chose" to "believe" that certain populations of apes slowly, gradually, inconspicuously evolved into first populations of the species Homo erectus, and then Homo habilis, and then Homo sapiens, and, hence, that there was no such thing as literal "first human couple" etc., then you are outside of *us*, our beliefs, and definitely not a Christian! Given the text of, say, Romans 5, your entire theory of biological evolution is a blasphemy (see GOCTheophan's first two or three replies to my post in the locked evolution thread in the Free-For-All section).
When I try to challenge this, I hear something like, "well, OK, if you think that science can correct Romans 5 - then can Romans 5 correct science?" And here I very emphatically say NO - and again find myself in a difficult position. The discussion again begins to degrade into the issue of "scientific totalitrianism." My only point, actually, is that scientific truths (yes, tentative as they are!) cannot be dismissed based on any "text" - no matter how much respect and "clout" this particular text has among people who belong to particular belief systems. But I somehow was never able to drive this point across.
Again, my apologies for being too harsh on people, and my thanks to you for great replies.