So you accept this definition of god because the Bible says so?
I accept this definition of God because the Bible says so. I provided this outline from the WCF and its supporting verses since I take the view that learned academics over a long period of time debated these particular meanings and put them together. People from various backgrounds and different views.
How do you know the Bible got it right?
Great question. Perhaps it got it wrong. But at least it is consistent and makes sense to me.
One reason I believe (not the only one) in God is because the alternative is simply irrational. It is totally unreasonable and implausible that everything that exists in all of its myriads of ways simple came from nowhere and without purpose. None of the theories that anyone has put up has really provides a satisfactory response or answer to that.
This belief in God of course does not necessarily extend to believing in the God of the Bible. Of course the God of the bible is one of the few gods who actually makes the claim of making everything. Most gods in most religions are very specific in their deity status and what they represent and don't claim to be the creator of the universe.
The God of the Bible also is one of the very few gods who provides a transparent and objective communication with humanity. It is one which specifically states it is his word. Not every religious book does that. Not that necessarily proves anything except I suppose he is not hiding anything.
The Bible presents God in ways that are both mysterious and simplistic. It provides a purpose for the world, and a plan. It explains the problems of humanity and a solution. It doesn't pretend to be book that that is easy to read - and nor does it necessarily fit with out concepts of what God ought to be like. It answers many questions and leaves many unanswered.
Respectfully, I don't see the other religious books doing this. And I don't see the other gods doing this either. Most are simply about appeasing the gods and doing their will. The biblical God has some of that - but much more as well.
The Bible doesn't pretend that its heroes are perfect - save and except Jesus. No one else in the entire bible is seen as exemplary in that manner. In fact most of its heroes are downright - scumbags. David had troubles- Jacob was deceitful. Adam - the first man stuffed up the entire world and his son was the first murderer.
After Jesus, Paul and Peter and James etc - none of these are portrayed as perfect. There is no pretence - it gives the book credibility.
Of course there are the miracle stories and the creation and the Noah's flood. And Jesus rising from the dead. Yet the interesting about the bible is that these things are rare. They are special events. Not the norm.
so my answer to your question about how can I know it got it right?
Well, what is the alternative? That God created everything - but then left us to muddle on our own. To leave us without communication with him. That he made life for a purpose and then never told us about it.
I suppose - he could have done that. Yet it really makes no sense that God would create and then just leave us alone.
I mean, why should I accept the Bible as authoritative regarding god?
Another good question. I think in the first place - that you are an intelligent person - that is a good reason to accept it. Intelligent people make good decisions.
Secondly, you can't beat something with nothing. If you have a better alternative go and do that - don't waste your time on religious forums waiting for someone to give you an answer.
Thirdly, it will change your life. And respectfully, I think that is what you are hoping some one can provide you with.
At the end of the day though, it's not just about being smart enough to understand the gospel, or wise enough to make a good decision, it's about regeneration.
And I am happy to talk to you about that if you ask.