>I really just can't understand this frame of thinking that says Judaism is good because it's been going on for long.

Im not a rabbi or in kiruv or anything, so take this with a grain of salt...but I would point to Jordan Petersons position about the longevity and survival of the bible stories and his response to atheists around it all sounding made up.
There is a reason these stories survived through the ages. There is wisdom and much to learn from the ideas in the Torah even if you dont buy into their accuracy. It's just too shallow to dismiss it as superstitious ancestors who werent as smart as us.

From a purely pragmatic standpoint, the very fact that we are finite beings in a world that will survive our existence means that our life will face tragedy...and the best way to cope with a tragic existence is to find meaning in life and in our actions.

Most fundamentally is buying into the idea that we can bargain with the future and that decisions we make today matter and have an impact on the future and future generations.

From that context, ritually connecting with the past and exploring how things that happened to your ancestors have an impact on your existence today is about the best way I can think of to get you to internalize the idea that what you do today matters to tomorrow.

The idea of mesorah(transmission from generation to generation) is framed as a way to verify the validity of the stories...but I really think its more along the lines of showing the unbroken chain between the past and the present...so you can internalize the responsibility of the chain between the present and the future...

It sounds like you've decided to start a new chain for your children and sever that connection to your past. For me, I think the responsibility and ramifications of that decision are massive and at the very least deserve a reckoning with the significance of how the decision impacts future generations regardless of what you finally decide...it feels to me that because you werent able to internalize the ideas (regardless of the factual nature of them) of "Hashem took ME out of mitzrayim" or "had the exodus not taken place, we would still be slaves" ...and never connected with the powerful idea that we eat matzah to commemorate what our ancestors ate rushing out Egypt...you either feel the decision for keeping your future generations connected to the past is inconsequential, or the past is blatanly wrong.

Considering you grew up religious, I am assuming you had a modern Yeshiva education...like many others, it sounds like they failed to show you the pragmatic wisdom in yiddishkeit and instead left you feeling unconnected with your brilliant history.

I would encourage you to try to pass on the parts that you did connect with and the pragmatic wisdom in much of the torah and halacha to atleast give your children the chance to make their own decisions.

You can reject the bible and reject religion and put science on a pedestal...but the idea that what you do matters and that you can bargain with the future...and that who and where you are today is a product of decisions your parents and their parents made...that lesson is too important not to pass on.
It would be a shame to be passedover!