Is it possibel to do the quests, all of em while being evil, and how adversely do NPC's treat you considering your alignment, and at what point do party members leave depedingin on your rep

i.i minsc at say rep 5 he leaves..

any help is appreciated thanks

For when an NPC will depart from your party, check out page 240 of the BG2 game manual at "NPC Reactions Toward Reputation". Reputation is the key that determines the "exiting" of certain NPC in your party.
And yes, as long as you donate a healthy amount to temples, I don't see any problem taking all evil path on your quests. Just maintain your rep in a neutral position.

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And if you have an evil party and your reputation is too high, just kill a commoner. Make sure that no one sees you. It will remove half of your reputation, but you can still buy some.

minor Firkraag spoiler content
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Best to keep your rep between 6 and 18 if mixed-alignment party. If too low, buy up. If too high, lay down some smack on an out-of-the-way commoner (I did one of the brats in Imnesvale for this - the mayor in Trademeet is also good for this)
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I have completed it twice evilly. In fact, working FOR Firkraag, then killing him after raked me more xp than rescuing the girl and killing Firkraag - hee!
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Nice, thanks for the advice!

It's better to try and keep a good reputation though as you get things cheeper and you get a better rection adjustment............

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Korgan gets mad when you except quests that our out of the way and their is no one their to negotiate a reward like the umar hills and trademeet but as long as your reputation is low he wont leave.

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