The importance of education, has led to the companies and potential employers putting different values on degrees and certifications. Even, if they are ranked the same in educational terms the title of your degree seems to have the loudest voice in that conversation.
It is not impossible, for you to get a job in the IT industry without a degree or certification in an IT related field, just that the chances are lower than a person with even less experience, but with an IT certificate obtaining that same position.
One of the biggest reasons why companies seem to favor IT certificates, is that generally you will know how to organize your work better and more in-line with industry standards. While it is possible to be up to standards with your skills and be just as organized however, it is a lot harder to prove that to a hiring manager especially at the volume of resumes they take in each day.
If you do manage to land that IT job without the certification or degree, you might also find it harder to advance or find your pay lower than the person working next to you doing the same job as you.