Is the church really that inflexible? Surely your other friends can stand up there with your children catholic or not? I'm not sure that I'd be annoyed with you as such but more so the feeling of being snubbbed by the church and not good enough to be a guide or godparent to your children if I'm not a practising catholic. Can you have 2 parcticing catholics 1st inline and then the others? If you can only have 2 people up there then just choose the 2 catholics and have the rest sit in the front row at the church then have your own special speech or ceremony etc at home during the after party/gathering.