Yes ‘Bharat Mata ki Jai’ is communal. Because it forces a certain mythological idea of motherland being a Devi, a deity.
This may suit your faith and religious philosophy but not people who believe in monotheism- one God.
It is clearly a majoritarian slogan.
Swami Rambhadracharya:
"Hinduism is under threat in India! Western Uttar Pradesh feels like mini Pakistan. Values of Sanatan should be taught in every hindu household. We don't hurt anyone but will not spare if attacked"