From Wiki:

Jindal was raised in a Hindu household, but converted to Christianity during high school; and during his first year at Brown University, he was baptized Roman Catholic. The Jindal family attends weekly Mass at Saint Aloysius Parish in Baton Rouge, Louisiana.[12] Jindal’s Catholic faith includes a solidarity with other Christian denominations; he has given speeches and offered religious testimony before Baptist and Pentecostal congregations.

Do we know if the churches that he attended were all Catholic churches?

The devout Catholics that I know typically don’t worship with other denominations on their Holy Day. They seek out a Catholic mass in whatever city they happen to be visiting. And if they can’t find a local mass, they’ll travel to a nearby town to get to one.