I read this in its entirety, so hopefully you take this seriously..
You are using the word "know" incorrectly, as it stands, from reading your OP, you don't know God exists. You believe one does.
The story about your dad is very sad, but you should understand that you were in a vulnerable state of mind at the time, just like being drunk, your mind was not capable of making rational decisions regarding the existence of God. Being in that state of mind and feeling the combinations of emotions that you were going through at the time are not a good point to start from when asking existential questions about the universe and existence. Ask yourself these same questions in a healthy state of mind and you'll likely end up with very different answers.
The coincidences aren't coincidences when you're an emotional wreck seeking answers, they're confirmation bias not based in reality. You wanted answers, so your brain found them anywhere it could. During times of grievance and emotional distress it's extremely common to feel what you felt at the time, it happens to us all.
The problem with your reasoning and conclusion that God is real and that you recognized signs of his existence is that there's no connection outside your mind between what you felt and God. You linked the two because you needed a resolution of the situation and a hope to hold onto. To illustrate what I mean, why God? Why not Allah, Buddha, or any of the thousands of unknown Gods that came before them, or even fictional Gods like the flying spaghetti monster or Dr. Manhattan? Why "God"? (Am I right in assuming you were born to western parents in the western world?)
None of this negates what you felt or what you believe happened to you. I just wanted to clarify my position
