I grew up in a typically American, mixed (secular/observant)Jewish family.
From an early age I learned that some things can be argued and some were sacrosanct.
We were taught the Exodus, and the miracles that provided, and the Revelation at Sinai (where G-D gave Moshe the Torah and mitzvos), witnessed by 600,000 Jewish males apart from women and children, i.e. the whole Jewish people. Our ancestors witnessed this great experience and transmitted this to their children and their children, from generation to generation to this day. There has never been a break or interruption in our history and tradition from the time of our first Patriarch Abraham.
Even during the times of the greatest persecutions, and even after the destruction of the Holy Temple, there always survived large numbers of Jews who preserved the text of the Torah and the traditions, so that chain has NEVER been broken.
At no time, even during the worst pogroms, massacres and the holocaust, were there less than millions of Jews faithfully maintaining this tradition.
So in spite of whatever arguments I can come up with----and to argue Torah and Talmud is endless-----Who and what I am and the history of my people is as ingrained in me as the instinct to breath. Its just who I am and I always will be.
Now, my life has taken me down some pretty rocky roads (as it has most people) and I've gained some new beliefs along the way.And I had some old beliefs "altered" a bit.
However, since I've gotten a little age on me, I have become acutely aware of the spiritual bond I have with G-D, and I find it is an essential part of my existance, that I do not want to be without. I may not have always recognized it for what it was---especially when I was younger----however now I feel I must remain "plugged in" to that spiritual connection.
Hope my prospective provides some useful insight to your question.
My two shekels.