I am new to the god wars dungeon and am unsure about something. if I have a bandos godsword, the bandos beasts dont attack me, however, is this true for once I enter the bosses chamber to fight the general and his minions, or will 4 attack me at once? thanks 8-)

Yes they will all attack you. it is the same for every boss in gwd.

Yes, as long as you have a god item equipped for the monsters you want to stay away from, you will be fine. Just don't take it off. However, like you guessed, as soon as you enter that boss chamber, the main boss and the minions don't give a damn that you "worship bandos" and will try to kill you.