The question is somewhat meaningless, in that we are all affected by our environment, our upbringing, our our genetics, our education, our society, the times we live in, etc etc. To speculate on what we might believe if we were tabula-rasa (a dubious concept itself) in a societal vaccuum is a pointless exercise, as no human grows up that way.
For instance, since you mentioned guns... I grew up in a rural household where guns for hunting, sport and defense were an everyday part of life. I first started shooting at age 5. I took it for granted... I was in my teens before I truly realized that people who literally hated guns were not some tiny lunatic fringe hiding in a cave somewhere, and I found the notion that there were millions of people like that astonishing and baffling... as baffling as you might consider people who hated bicycles, screwdrivers and power-saws.
In college I encountered some of these mythical creatures, people who were actually anti-gun who could articulate their reasons in some fashion. Intrigued, I began to wonder if perhaps that which I'd grown up taking for granted might actually be wrong.... I embarked on a lengthy study, reading several books and consulting such stats and data as were available in pre-Internet times, genuinely seeking to determine where the truth lay.
I will leave the revelation of what conclusion I came to as an intellectual exercise for the student.
My intellectual conclusions were tempered and tested during the years following, both the time I spent in Law Enforcement, and other incidents including the murder of a dear friend and losing several less-dear friends and acquaintances to violence; and a couple of incidents I barely survived.
Will a person who knows nothing of the existence of snakes, think to wear sturdy high boots in rattler territory? No. Our environment affects what we see as necessary caution.
Something similar regarding religion. Grew up in a far-right fundamentalist "Evangelical" church (parents were not as far right as the church but that's another story). Questioned most of what I believed from 19-22. Reaffirmed my faith in Christianity at 22, albeit with a considerably more tolerant viewpoint on moral/cultural issues than my old preacher would have approved of.
Politics? My parents were JFK Democrats and Reagan Republicans, fairly conservative but not rabid about it. My sisters were hippies, and ranged from radical far-left to apathetic. The rest of my family varied also. My journey to get where I am today (independent centrist, leaning mostly center-right) was a long one, passing through the range of conservative and libertarian philosophies, including a brief flirtation with anarchy and a short affair with authoritarianism, and a half-nod to certain center-left economic policies.
Certainly I was influenced by my family, friends, teachers, education, environment, experiences... everyone is. But there were intellectual processes ongoing throughout it all. Sapience means an opportunity to think about things and CHOOSE... and I certainly did some thinking and made some choices along the way.