Protestant countries tend to view themselves as more open minded than countries with a single dominant religion. However, some of that apparent tolerance is actually reserved for other Protestant faiths: Baptists marrying Methodists, or Presbyterians marrying Episcopalians. When I was married, the ceremony was performed by a Presbyterian minister. He agreed only because my wife had been baptized as a Presbyterian and despite the fact that I had never been baptized. Many other ministers were unwilling to perform such a ceremony at all. Many of those barriers broke down as the country became increasingly secular in the 60's, but the pendulum now seems to be swinging in the other direction.
As with Catholics and Jews, Muslim parents are expected to raise their children as Muslims. It is their religious responsibility. However, children are not expected or required to participate in daily prayer rituals until they have reached maturity. Parents are expected to send them for religious training when they are young, much as Protestants may send their children to Bible school, or Catholics send their children to parochial schools or, at least, catechism classes, and Jewish children are routinely sent to Hebrew classes where they will study the Torah and prepare for their entry into the faith at the age of 13. As with churches that have adult baptism, Muslims must make an individual decision to practice the faith. Like Judaism, and unlike Christianity, salvation for Muslims is dependent not on faith, but on adherence to religious law and by good works (charity ranking very high on the list).
Contrary to what Gman claimed, Obama is not a Muslim by birth under Islamic law any more than a Baptist is Baptist by birth. There is no such thing. He is not a Muslim because his father was a Muslim. Once his parents divorced, under Islamic law and practice, his mother became responsible for his religious education and she was never a Muslim. Obama also returned to America before he reached maturity and was in a position to make a choice of religion.
When Obama chose to be a Christian, no Islamic law was violated. His choice may still be surprising given the fact that he came from a non-religious household. However, nothing about his birth of upbringing made him a Muslim.