It's not just the shared religious values, per se, that are important, but also the effect that their socially ingrained Judeo-Christian beliefs have on personality and social development that make all the difference as I see it. That is, even if a Filipina were not "ultra-religious," she would still possess certain beliefs, characteristics, and sensibilities that are not necessarily typical of other Asian cultures.
You are right to suggest that Filipinas are extremely devoted to their families and, from our Western male perspective, are extremely self-sacrificing—although the women don't necessarily see it that way: They are just doing what they believe is right, what they were raised to do based on what they deem as most important in life.
Marrying a Filipina is like entering a time machine that takes you back to American family life in the 1950s and early sixties, a time when gender roles were very clearly defined and respected without resentment, acrimony, or a sense of being treated "less-than." Depending on the man's age, family background, and belief system, he will either cherish this arrangement (literally feel as if he has died and gone to heaven) or possibly find it burdensome, i.e., too "retrograde" or anachronistic.
Filipina core feminine identity is very tightly connected to and integrated with not just their home life but their living space: Most are immaculate housekeepers and take enormous pride in having not just a clean home but one that is warm, comfortable, and inviting—and that includes making their husbands as comfortable as humanly possible as well. In many respects, one can accurately think of Filipinas as "counter-narcissistic."
During our first year of marriage, I often found myself telling my wife "Okay, that's enough. Stop now. Take a rest, you're doing way too much," because, quite frankly, I wasn't at all comfortable with the amount of attention she would bestow on me and the home. It was not something I was used to and I feared that she would eventually develop a resentment. Finally I came to realize that she wasn't doing all of these things just to make me happy. She was doing them to make herself happy as well. Now, two years later, I just keep my mouth shut and let her do what she wants to do. I can honestly say that we both are extremely content and know that we have been blessed.