ALLAH SWT says in the Holy Qur'an "do not marry a mushrik untill they embrace Islam,a MU'MIIN is better than a MUSHRIK even if you like them"
No,you cannot a muslim guy untill you embrace Islam.
Irfan,you are wrong,it is not 'preferable',it is a requirement that both should be muslims in order to get married.This is the Islamic point of view.