I would like to know why to choose to accept God's law. Is it because He is powerful and can reward and punish you, or is it because He is good?
This is a serious question. Are you rooting for a team because you think it will win, or have you chosen sides because of some innate quality of the team captain?
If your moral compass is not innate, how do you make the choice?
It is because He is our Creator and He is the source of our lives both now and after death. Not all Christians are concerned about the reward/punish aspect that you bring up. For some of us, salvation cannot be earned so the carrot and stick approach is irrelevant.
Some else here brought up the Golden Rule as an appropriate standard. I remember being totally shocked when a very smart friend of mine told me that she despised the Golden Rule because she did not necessarily trust the intentions of those who held it.
The more I thought about it, the better I saw her point. Just because YOU are okay with being nagged or demeaned or deprived of liberty in certain circumstances doesn't mean that I will be okay with it.
I personally have accepted God's law because that is what I was taught and learned. I believe God is good.
I root for a team that I think will win in human terms. Spiritually I root for who I know will win.
The only other way to make the choice IMO is to learn what's right and wrong.