anyone know anything about the Priest Trương Bửu Diệp?

so i'v gotten really curious about this priest recently because it's been popping up here and there. but before all of this, i'v seen his little picture in almost every asian house i'v been to 0.o.... even my own house have it!!!! i remember when i was younger i ask my mom who that picture is? but i forgot what she said :I.... and now i'm seeing it in my news feed once in a while. i'v done a little research, and know the basic stuff about him, but most of the grater info is in viet.... i'll tell you this, i'm Buddhist ( not a very dedicated one though) and if this man is a Catholic, why are there pictures of him in buddhist homes? not saying you can't have another religion in your house or anything :P i just want to know who this majestic man is :O...