A potential argument for existence of God

[FatAndFaithless]

The universe had a beginning.

You're off to a bad start. We don't know anything about the state of the universe before the Plank era, so any assertions you make about it are going to be entirely untestable and unverified.

Therefore there can be only three possibilities: either it was created from nothing, it created itself, or God created it (an Uncreated, Eternal, Self-Subsisting, Willing, Powerful Being).

How do you know those are the only 3 possibilities?

The universe couldn't have created itself because it was nonexistent before its creation.

Another flat assertion. We don't know anything about the universe before the Plank era, and I don't know of any accepted theory in science that asserts there was 'nothing' before the universe, especially because 'nothing' means about a dozen different things depending on its usage.

And if it was created from nothing, because nothing existed, there were no factors to narrow down creation to a certain kind of thing, and thus nothingness had an infinite amount of options to choose from to create something.

More of the same vapidity.

We know that it did choose a particular one. Therefore, by choosing a particular one, it (nothingness) discarded all the other options. Hence, nothingness has an inherent quality of picking certain things and not picking others, and also the power to create its chosen option. But how can nothingness have such qualities of power and choosiness; it is nothing; it  has no quality or disposition! If nothingness does indeed have these qualities, then it is no longer nothing; it would be a powerful, choosy being that has the ability to choose freely (because there are no factors to limit its choice) and hence has a free will, and is uncreated. Sounds a lot like God!

Keep in mind that the resulting "nothingness" with its mentioned qualities does seem to match with the Islamic concept of God, because in Shia Islam, Allah (God) is nothing but His Qualities; His Qualities are Him, and are His Essence.

Your entire 'argument' is based off of completely baseless assertions about the origin of the universe. You've literally started with one massive, untestable presupposition and then keep tacking more and more additional untestable presuppositions onto it.

Nothing in your argument can be tested, nothing in your argument can be measured or examined, nothing in your argument can be used as a basis for further argument.

Your argument kinda sucks. It's some Kalam-on-steroids bullshit with about as many bald proclamations of knowledge as I've seen in such a short space.