Hmmm. Are you sure you want to make that assertion? Tell me, if a child dies three days after birth, before it has a chance to be christened/baptized, does it go to heaven? Hell? Research that question in Catholic doctrine before you answer.
As a medievalist by trade, I can tell you in no uncertain terms that the Catholic church has "modified" quite a few elements of its creed over the past 2,000 years...
SD
Please elaborate. Keep in mind that by "the Creed" Catholics refer chiefly to the "symbols" of faith as presented in the apostles Creed and the Nicene- Constantinopolitan Creed. Apart from the filioque controversy (which is more a matter of language and translation than anything else), what "modifications" do you mean?