Yes. He gave his life so a Jewish prisoner could be spared. While that is the ultimate act of charity, it is not dying for the Faith.
If Maximilian Kolbe is martyr then every fireman who ran into the burning World Trade Center buildings should also be a martyr.
I have no problem with that at all.
Would you have the guts to run into a burning building to rescue another human being knowing you may not come out again?
What do you think the Faith is anyway? How can you die for a God you do not see if you are not willing to die for a human being you can see?
Perhaps you should check out the Gospel of Matthew and the criterion Jesus says The Judge will use. He never mentions how many times we go to Mass, or even what Mass we attend.
No, all He discusses is "As long as you did it for one of these, the least of my brethren, you did it for me."
Mother Teresa didn't live her life for "The Faith." She lived it for the poor, and is in heaven because of it.