Um, I think we have a vast amount of evidence to say otherwise. Most people vote for the same political party as their parents after all.
You are comparing upbringing with indoctrination. Yes, you are more likely to vote for the same political party as your parents because you were given certain values that align with said party through your upbringing, increasing the likelihood you'll be into the same political party than your parent. This is even more true in a system like the US, where you're literally choosing between only two options, which appear quite polarizing in their standpoints. It is much less prevalent in multi-party systems.
Religion is another matter, most people that leave religion do so between the ages of 10 and 17:
And it is losing Catholics at a young age. ”The interviews with youth and young adults who had left the Catholic Faith revealed that the typical age for this decision to leave was made at 13," Gray wrote. ”Nearly two-thirds of those surveyed, 63 percent, said they stopped being Catholic between the ages of 10 and 17. Another 23 percent say they left the Faith before the age of 10."
...
The most common reason given for leaving the Catholic faith, by one in five respondents, was they stopped believing in God or religion. This was evidence of a ”desire among some of them for proof, for evidence of what they're learning about their religion and about God," Gray said.
http://www.catholicnewsagency.com/n...ge-10-and-what-parents-can-do-about-it-48918/
Which makes sense, because as I said, this is the age where you start questioning what you've been taught and start forming your own opinions on matters. Religion is not a matter of values, either, it's a matter of fact. If you go by the values religion teaches, you can find a home in pretty much every religion, as 95% of them teach the exact same values. The doctrine is where the changes lie, and that's where the problem is. You can tell a kid one specific deity exists and they'll accept it (your parents are an authority, after all), but you can't tell a 17-year-old that without backing it up.
That's not to say the teen will lose their faith, but I guarantee you every single teenager brought up in a religious family has questioned their faith at some point and made up their own mind.