The questions we must first ask in relation to our question:
If your faith is determined solely by family or location, could a lack of faith not also be attributed to family or location?
Is Christianity just a western religion?
What about those who have converted from atheism to Christianity?
If all faith and religion are dependent purely on one’s upbringing, then a counterclaim can be made that those who are atheists, agnostics, or of any other denomination of unbelief are simply of that belief by way of their upbringing; all belief and unbelief should therefore be subject to scrutiny.
To use Christianity as an example of faith based on location would also seem illogical, as throughout the world, there are an estimated 2.2 billion Christians, with an astoundingly even distribution of followers throughout Europe, the Americas, Asia-Pacific, and Sub-Saharan Africa.
Although not a direct argument for faith, the fact that many millions of unbelievers have converted to Christianity impels each of us, regardless of our beliefs, to question what we have been taught, to evaluate the claims of not only our own ideas but those of other faiths, and to come to an evaluative conclusion where truth is of the utmost importance.
Conclusion
The idea that faith, or the lack thereof, is a derivative of our upbringing is in part true. The suggestion that all faith is false, on the other hand, directly contradicts the faith of the person making the claim—there could be no truth if everyone's upbringing was based on false ideas. This leads us to question our own beliefs and the beliefs of others by using truthful and honest eyes and looking to see in which faith the truth resides.