1) Yes you can also see out series in Islamic Beliefs:
2) We get to know God this way:
A- By seeing His power in the universe. We come to know how knowledgeable he is and how powerful he is
B- By knowing that he’s the opposite of his creation (he’s unlimited, he’s not physical, he’s not in need, and so on…)
C- We cannot know Allah’s essence because it’s unlimited and we cannot grasp that which is unlimited. So we cannot fully know God. It’s impossible.
D- God has described some of His attributes to us and He has shown us to have a relationship with him, so we go by what he teaches us