Many Hindus, especially those abroad, love Christmas - for example Christmas at a Ram mandir: https://www.youtube.com/watch?v=AV2DzaAsADc . Rajiv Malhotra can be seen hand-wringing at the end of the video - but people are voting with their feet.
Wiki says about the immensely popular Sai baba:
Sai Baba also condemned distinction based on religion or caste. It remains unclear if he was a Muslim or a Hindu. This, however, was of no consequence to Sai Baba. His teaching combined elements of Hinduism and Islam: he gave the Hindu name Dwarakamayi to the mosque in which he lived, practised both Hindu and Muslim rituals, taught using words and figures that drew from both traditions, and took samadhi in Shirdi. One of his well-known epigrams, Allah Malik (God is King) and Sabka Malik Ek (Everyone's Master is One), is associated with both Hinduism and Islam."
In Tamil Nadu, Hindus go to Muslim imams to cure disease and remove spells.
Is this only a modern phenomenon or have scriptures talked about it?