Why does He need to come down and answer your questions? Why don't you start with what information you have and work with that? Most people don't ever make a sincere effort to take the information that has been given them and use it, or they come with a closed mind and presuppositions (i.e. "The bible if false, but I'll try it." Atheists reads the book of Numbers. "Yep, just like I thought, no answers.")
You won't understand why Yahweh is worthy of worship because you are predisposed to not want to know. But I would answer your question if you will explain how you would be qualified to pass judgment when you can't even spell it correctly.
Muslims, Mormons, Hindus, and countless others try to say this same thing to us non-believers. Your words are exceedingly ironic in that you
came to the bible with an assumption that it was true (which was influenced by the culture of which you grew up - aka you started with your conclusion). The problem with your assessment though is that I (and many others here) believed like you do for nearly 20 years. I later discovered how irrational theology is and how Christians have to spin, rationalize, dodge, use confirmation bias, and/or lie to continue arguing for it.
These things are evidenced in you by your own words - aka the irrational arguments you chose to accept for deism first (namely an argument from ignorance/incredulity fallacy - likely among others) and then onto full superstition in the bible. How can you claim to be neutral and/or open-minded when you are wholly committed and uncritical of your own view?
I don't know why God chose to reveal Himself this way in different places in the Bible. Since the Bible says that He is one God but expressed as the three Persons, then I guess He is just trying to help us understand Him. Why does He call Himself Jehovah Jirah in one place, Jehovah Nissi in another, etc? Each time it reveals something of His character.
The "trinity" is just one example of religious SPIN. The bible does not say "one god in three persons". You say that.
If you were actually willing to be critical of this view you would accept it as a direct contradiction. 3 cannot equal 1, and that the bible says there is only one god but then mentions multiple gods. Your reinterpretation of it (and those of your predecessors) is a spin tactic b/c you started with the conclusion that it CAN'T be a contradiction (in fact the Jews and other Christians don't even accept it but that is where your confirmation bias begins). How convenient that you do this with all of your theological beliefs (assume that they can't be false and then mold/squash/reinterpret them to fit your prior theological commitments). Honest skepticism (the kind you would practice toward Islam, etc) says otherwise.
This is far from being open-minded. It is closed-minded in the highest degree b/c you have committed yourself to confirmation of your assumptions NO-MATTER-WHAT.