Final answer:
A few adolescents totally reject the religion in which they've grown up, but this varies widely based on individual circumstances and cultural background. Surveys suggest that while there is a trend towards secularization, especially in developed countries, there's no clear data supporting that most adolescents reject their childhood faith entirely.
Step-by-step explanation:
To address the question of what percentage of adolescents totally reject the religion in which they've grown up, we must consider several factors. First, studies show that religious adherence is often strongly influenced by family and cultural background. In places where parents raise their children with a strong religious identity, children are more likely to adopt and maintain that faith into adulthood. However, this is not always the case; young people have agency and might choose to reject or question the beliefs they were raised with.
While there is a noted trend towards secularization in many developed countries, with declining attendance at religious services and participation in religious activities, it's important to remember that this doesn't necessarily mean that a majority of adolescents are outright rejecting their childhood faith. For example, a study indicated that although many Americans identify as Christians, a number of them can be described as secularized in their practice and beliefs.
Surveys and research have shown that religious beliefs and practices are changing, but suggesting that 'about half', 'about three-fourths', or 'almost all' adolescents totally reject their childhood religion is not supported by the available data. It's more accurate to say that a few adolescents may wholly reject their upbringing religion, but quantifying this is complex due to the nuanced nature of personal belief systems and religious identification. Moreover, significant numbers of individuals who describe their religion as 'nothing in particular' are not actively looking for a new religion.