If you reject the Catholic Church you reject Christ, so no, you cannot be saved in that frame of mind. But of course, you can be converted to Christ and His Church as late as in the moment of your death, or else you may only know Christ through the means and graces available to you, which are not Catholic, yet never reject His Church actively.
It is not as simple as saying that non-Catholics cannot be saved. It is a complex teaching that is easy to misunderstand. Yes, that and every other teaching of the Church should be taught with brutal clarity and it not always is.
In the sense in which it was proclaimed originally, extra Ecclesiam nulla salus holds. But there is hope for non-Catholics and even for non-Christians, of conversion.
Do you think Christ and Christ’s body i.e. the Church are distinct entitities?