I am an atheist because I started outside religion, and I have never found a reason to go inside. Religion was a non-issue during my formative years, and over those same years and beyond I have never heard an argument for religion that ultimately did not reduce to “Because I/he/they said so” or something similar.
Those “profound” rituals that form a central part of so many people’s lives are only confusing or ridiculous to those of us looking in from the outside, just as the rituals of one religion look ridiculous to the followers of another. The “sense of community” that people find in their religious groups, I have found in my peers, coworkers, friends, and humanity at large. I have never found a need for religion in my life; I do not need nor want an imaginary friend in my life, I have enough real ones.
Finally, the petty tribalism that religion engenders, defining “us” and “them” based on what and how you worship, is a divisive force that our collective society, already shot through with divisions both real and imaginary, doesn’t need. If we truly seek cooperation instead of conflict between all the diverse members of humanity, we need to tear down or fill in every boundary we can. We need to act in this world, not waste our time in pointless pursuit of some imaginary next one.