Question

Why different religion people can't love?

Answer 1

Because of the society. The mentality of the society thinks that it is wrong ,and no one can take a step against society.
But love can cross the boundaries of rules. This depends on your mentality.

Answer 2

this depends upon us and our thinking no one would dislike or like others on the basis of religion, caste, creed, etc.
so we have to think and treat others equally.