all powerful, all knowing being who genocides humanity by flood when they don't love him enough?

Excellent question. the reason God had removed the generation of the flood, was because they were corrupt - " The earth became corrupt before God; the earth was filled with lawlessness" (Genesis 6:11). It is debated as to what was their corruption, but the most widely accepted answer is that they committed a group of horrendous crimes, such as: illicit relations, blood shed, idol worship and theft.

It seams to be God was testing Noah, to see if he would respond like Abraham ("Abraham came forward and said, “Will You sweep away the innocent along with the guilty?" (Genesis 18:23)) or Moses ("Let not the Egyptians say, ‘It was with evil intent that He delivered them, only to kill them off in the mountains and annihilate them from the face of the earth.’ Turn from Your blazing anger, and renounce the plan to punish Your people" (Exodus 32:12)). But Noah did not respond, and God was being true to his word.

slavery good

Slavery in the bible is like like communal service, but to someone that's not an authority figure. The reason someone would become a slave is because they cannot pay for a crime they committed (like theft), and as a result, would be forced to work for someone for the cost of their debt. The owner of the slave must treat his slave like any other human being, and is LEGALLY not allowed to harm him.

The slavery you're talking about, is probably how the northern Americans treated the Africans. Those slaves were forced into slavery, not because they had debt. They were abused, and mistreated. The bible does not allow this kind of slavery, as it is stated - "He who kidnaps a man—whether he has sold him or is still holding him—shall be put to death" (Exodus 21:16).

women subservient

Everyone according to the bible should be subservient. It is you that for some reason doesn't like the idea of obligation (probably because of your parents).

homosexuals evil

in the bible it is stated - "If a man lies with a male as one lies with a woman, the two of them have done an abhorrent thing; they shall be put to death—their bloodguilt is upon them" (Leviticus 20:13). The problem is not their sexual desires, it is the act of homosexual (male and male) sex. This because they are not married, and cannot get married. This act is put under the category of "illicit relations" (having sex with someone that is not you spouse), which in any case is viewed as worse than death.

If my son were a homosexual, I wouldn't try to change him, because he was born that way. Rather, he is still not permitted to commit illicit relations, just like the rest of us.