That married a Buddhist and let his kid be raised into Buddhism? Hardly. Next time, think a moment before you write.
It didn't say WHEN the woman became a Buddhist; for all we know, that may have been why they were 'estranged' from one another. And I don't remember reading ANYWHERE that they raised their son in ANY religion, which is why I think he gravitated to Islam and especially the Taliban. It is a very STRICT sect, and I may be armchair psychologizing here, but I think that's WHY he liked it; he needed the structure because it didn't sound like he'd had much growing up.