Haha, that's a tricky one. Since I don't know too much about any of these other players, or the GM you've got, or the BSG setting (there is this one big ship that's kind of a huge deal, I suppose?), I guess I'll have to phrase my advice in really general terms. As a player, I do very often make characters with really outspoken opinions and who stand by their beliefs and so forth. With that said, I also do my level best to not throw a wrench in a game that I like
Whether this is advice that can apply to you depends on how much you like the game and the fellow players (and want to continue on with them

), and moreover the kind of GM that you have I guess. Can't speak to any of that for myself so there you go. From the looks of it drachenspirit seems like he'll be fairly conciliatory if you back down with a simple character realization along the lines of "my principles are meaningless if I'm not alive to uphold them." But that depends on how flexible you are in interpretaiton of your PC's personality.
GMing style is a tricky subject.
Despite my posturing I'm a huge softy of a GM usually. I'm nice to players but take a certain pleasure in giving them nasty encounters. I think it's possible to truly challenge the players and bring out the full spectrum of emotions in a truly considerable challenge without having to, OOC-wise, turn yourself into an ogre or anything. Likewise TPK, while a feasible option in this setting, is kind of an unimaginative way to handle a botched Angel encounter considering... options available in the setting. The grand N2 nuke "encounter-fail" is a loss condition built into the system for example, but I can think of others. AE is kind of my experiment in this theory.