I think birth certificate is really required to go along with all the documents to be submitted to CIC. Birth certificates shows ur date of birth, place of birth, your parents names and citizenships, hence it is a very vital source of information for your identification purposes...however if you can [provide other docs showing all the above items such as social security ID's in ur country, other government issued ID i think it be be fine...but you should include a letter of explanation why you cant provide a copy of your birth certificate as for the moment and pledge that will be sent ASAp once you get it...but im quite not sure abou this process...how lone does it take for you to secure a copy of ur birth certificate?