No, you will not be a kafir but you will be sinful.

If i celebrate someones birthday for example congratulating them and going to their birthday party, will i become a kafr?

Sins | March 18, 2014 9:37 am
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Please i want to know the rulling of working in banks. Some schoolars say its forbidden because banks make their money through profits, others say even islamic banks do the same.
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A FEMALE DENTIST IS ALLOWED ISLAMICALLY TO TREAT MALE PATIENTS?