Embracing Pagan Customs
Even though Christian missionaries took the pagan festivals as they were and gradually grafted their observance into their festivals, with all their rites and customs, they are still abominations in the sight of Yahweh. Read what He says in Deut. 12:29-32:
When Yahweh thy Elohim shall cut off the nations from before thee, whither thou goest to possess them, and thou succeedest them, and dwellest in their land; Take heed to thyself that thou be not snared by following them, after that they be destroyed from before thee; and that thou inquire not after their idols, saying, How did these nations serve their idols? even so will I do likewise. Thou shalt not do so unto Yahweh thy Elohim: for every abomination to Yahweh, which he hateth, have they done unto their idols; for even their sons and their daughters they have burnt in the fire to their idols. What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it.
What does Yahweh say about the leaders who lead people to follow such pagan beliefs?
For such are false apostles, deceitful workers, transforming themselves into the apostles of Messiah. And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works, 2 Cor 11:13-15.
Besides North American countries celebrating Valentine's Day, one can easily go on the internet and find out how this day is celebrated in many countries in Europe, Asia, South America, etc.