Why do you think existence is more meaningful if some god exists?
Most people believe in "reality".
I am no exception.
Reality includes a history of events, that include every leaf that has fallen.
The future is also part of reality .. we say "it has not yet happened", but tomorrow it becomes history.
One can think that what has passed is "gone", and cannot be ascertained, yet Einstein has shown us that it may not be quite like we think. The passing of time is merely "a perception".
Without God, history remains "dead", whilst while we are alive, it clearly isn't .. we have much to learn from history.
..but how many of us pay attention?
..many of us are too busy looking for "meat"
Civilisations rise and fall.
We see that rememberance of God raises us from our lower selves, and advance in education and knowledge have flowed from such civilisation.
It gives mankind a higher purpose .. and God is aware of our weaknesses, and knows that we cannot sustain success forever more..
..not in this worldly life .. generation follows generation .. and we begin to take things for granted.