Do Buddhists think other religions are wrong?
In Buddhism you have to straighten your views. In this process there may be times where you new views might start contradicting your previous beliefs or that of established religions. There are 3 stages to straightening your view:


You learn the Dhamma and see that this sounds right
You see it is logical
You practice and empirically verify and see that it is in fact true.


As a person taking the path you need not put aside any views as right or wrong to start with just because it is said so. Through logic and practice you start seeing things clearly then you can straighten your views. When you experience some thing sometimes even a a firm believer in Buddhism you would start seeing things in a new light and sometimes see your initial conceptual understanding differs from reality.

Hence the Buddhist position would be that conceptual / philosophical understanding is flawed. Your understanding is right only with regard to what you see at the experiential level. Hence any philosophical / conceptual aspect of any religion including Buddhism cannot be absolutely right.