Is a horoscope applicable to all irrespective of religion?
If you are living on planet earth in the form of a *Human Being, then regardless of caste, creed, race, religion, sex/sexual orientation or any other form of division, astrology and palmistry applies to you.
Of course for astrology you should know your exact birth details or an astrologer can determine the same with your help and for palmistry you need to have both your palms intact and readable.