As one who was brought up in a Christian household, and has spent his life in government jobs, is it just me, or does it seem like it's less acceptable to not believe in an omnipotent man in the sky, than it is to dedicate your life to something you have no knowledge of?
Belief is a belief, it's a perception, maybe an intuition, a hope, a desire. It's not knowledge. Knowledge is certain. I was also brought up in Catholic country. My parents sent me to religious studies, because that is what it was expected back home in Poland, however, they did not participate in worship. My mother was rather skeptical about the man in the sky. My father never talked about that man. I never questioned the presence of something larger than me, because it was like air that I breathe. I am not longer religious, at some point going to church was not satisfying. I believe there is something larger than me, because I have not created myself. We will never know for sure while being the body. One thing is certain, that if he exists, he is not of this world, otherwise he would live somewhere in the world. I suspect if we are his creation, then we are not of this world either, which tells me this existence is some form of illusion, a dream, but we are already in eternity. Long story short, we won't be able to resolve this on this plane, so just live and be merry. A side note: I don't expect anyone to agree with me, if you don't believe, I don't really care either. Just be and let others be.
Those who consider it less acceptable, often try to use social pressure to manipulate others . . . . . I was once invited to church by a rather insistant couple who evidently were convinced that I would cave in to social pressure. As they started a hymn, everyone stood . . . . I remained seated . . . . They were "offended", "embarassed", etc. Perhaps they learned something, although it is unlikely.
It depends on where you happen to be living. If you live in Pakistan, atheism is regarded with contempt. In Saudi Arabia you are regarded as a terrorist. In other parts of the world, people wonder why others waste their time praying to their fictional god.
Generally Christianity is a dying force global but still has traction in S America I believe. Islam is taking on a lot or Africa, but Europe is becoming more eclectic regarding its religious wholesalers. Unfortunately if you are in a N American enclave you may very well feel isolated