i want to be a good god for my people, but i really do good thing is build bars houses etc,
but the game said i still be a bad god.
what do i have to do to be good?

It really depends how much evil or good you do in the long run. For example how happy your villagers are effects your alignment over a certain period of time, try watering fields and god building, and build lots of decorations, make a temple or 2, get a univercity and most of all cut down on using armys for anything other than defence. I also descovered that if you have conquoured a village, if you there after ignore the village you will get evil points, so what I do is transport all of the villagers of the conquored village to my main settlement and then house any platoons or my creature there until the village is no longer needed or if you want to expand.

to be a good god you MUST accept migrations at soon as they get there, make your villagers so happy they would kiss you, space out the houses, build markets and bigger manor houses, build so many temples your eyes burst, keep desires down to a minimum and generally be nice to your beloved followers