Why are secular holidays, which are not innovations of the disbelievers and have no relation to religion, considered an innovation in religion, despite the existence of specific religious holidays? And does Ibn 'Uthaymeen's statement about the customs of the disbelievers that are prevalent among Muslims apply to "Mother's Day"?

If the occasion is purely worldly, unrelated to religion, not intended to draw closer to Allah, did not originate from disbelievers, and contains nothing from the practices of Jahiliyyah (pre-Islamic ignorance), then the ruling on celebrating it depends on the benefit or harm it achieves. In such a case, it could be considered among the masalih mursalah (unrestricted public interests), provided it does not contradict Islamic law or a specific proof.

Anything intended for worship, drawing closer to Allah, glorification, or imitation of the people of Jahiliyyah or disbelievers is a forbidden innovation (bid'ah). However, what is intended for organizing affairs for the benefit of the Ummah, such as organizing studies and meetings, which does not lead to drawing closer to Allah or worship, is considered a permissible ordinary innovation (bid'ah 'adiyyah).

The criterion for forbidden imitation of disbelievers is performing something that is specific to them. If something becomes widespread among Muslims and is no longer distinctive to disbelievers, then it is not considered forbidden imitation.

Celebrations that are not taken as a means of drawing closer to Allah, do not become like Eid festivals, and are not believed to have intrinsic merit, differ from the celebration of the Prophet's Birthday. As for "weeks" like Mosque Week and Tree Week, if they are adopted as a means of worship and designated for specific days, they are an innovation.

Regarding Mother's Day, it has become associated with celebratory manifestations and holiday rituals such as showing joy and giving gifts. It has also gained significant media attention and lavish celebratory ceremonies.