Will saying that i am areligious lead to different treatment by a dr?

Maybe, maybe not: It is more likely for a primary care doctor to consider one's beliefs, because in primary care, the doctor wants to care for the entire patient (body + mind). In other specialties, beliefs may not matter as much. For example, a podiatrist removing part of a ingrown toenail may not consider the patient's view on life, the pre-life, or the after-life. After all, it's just a toenail.

It shouldn't: A doctor should offer you his or her best judgment and treatment options regardless if your religious beliefs. Your beliefs may require the doctor to offer a different alternative but only after you say the first option is not viable. Don't be afraid to share with your doctor any concerns you may have to make sure you get the best care for you.