A key point in almost every Deist's journey to Deism consists of leaving behind what they came from. Every human is born into an environment with certain value or cultural preferences. However, very few people are born into Deist households. While this bodes poorly for the number of Deists worldwide, it is an important selection factor that ensures a high level of discussion quality in Deist circles.
As unfortunate as it is, Deism is not nearly as popular as it once was, or as popular as it really should be. When I see someone join or enter a Deist community, I see it safe to assume that they are already knee-deep into researching theological or philosophical viewpoints. It is very hard to just randomly stumble onto what Deism is. This isn't the case for most major world religions, as they are traditions passed upon from generation to generation. While not an inherently bad thing, it can cause issues when adherents only adhere solely because of tradition and not because of convictions in their religions truth. We shouldn't assume that all religious people are as such because nothing precludes them from having genuine conviction, however it is a notable issue that many admit to often.
In all my time in several Deist communities, I've never come across someone who has believed in Deism solely because their parents, or their community did. There simply aren't enough of us for that to happen yet. We can lament this, but it has it's positives. Truth-seeking behavior is highly encouraged and debates are highly productive because discourse consists of individuals who are readily open to that. This is often not the case in many other places where truth-seeking is discouraged and conformity is valued. A true belief is not always useful, and tradeoffs do exist where individuals have to pick between choosing how to act.
This isn't to say that Deists are perfect because we do have our own issues. One of the most notable being that looser-term Deism allows for the transposition of beliefs that "feel nice" but do not strictly make sense. Such a worldview is immune from criticism because it does not actually claim to be true, but only claims to make the believer feel good about themselves or the world. However, I am glad to say that I have found intellectually honest Deists to be in good proportion to those who aren't. Deism emphasizes truth over tradition and Deists usually reflect that.
As always, I will end with some notes and clarifications. I don't think being born into a culture is intrinsically bad. This is not an argument for Deist parents to not raise their kids as Deists. It is impossible to raise children in a void, they are born at a specific time and place to specific people. The best thing one can do is encourage them to seek the truth and lending a helping hand. At the end of the day we are beings with free will, who can choose what to believe and people prefer to believe things based on various factors. Sadly, truth is not always the dominant factor. I also do not think Deism has exclusivity on truth-seeking behavior, but I do think we have a greater tendency towards it because of how people come around to Deism. If you believe you prefer truth over tradition, I would highly encourage you to seek a Deist community and engage in discussions with them.