Thank you for the sentiment, but to be a NT Christian (which I come short in) is to seek to worship God in Spirit and in Truth, and while Christmas is (sppsd to be) about celebrating the blessed birth the living Lord and Savior Jesus Christ, but the yearly mandated (it basically is for any church leader) celebration of it was part of Catholic religious syncretism, which the NT church did not example, and is contrary to it in principle.
Which is the reason it is so hard to "put Christ back into Christmas," because while celebrating events in the life of Christ, as the Lord leads, is honorable, and giving gifts to Him is Biblical, as is showing His grace to others, yet the yearly annual celebration that began with Catholicism and its religious syncretism (even if the Lord possibly was born in 12-25 when a pagan feast ended, this celebration was a later development not seen in Scripture, and was part of Catholic accommodation of pagan celebrations) is not according to the New Testament in practice nor in principle. Much less with its Christ-Mass as well as its Santa-christ and trees that children knell before, , etc.
And as said, observance of this annual event is essentially required, thus about 48 weeks a year a pastor can preach whatever the Lord leads, but come December he better preach on Christmas themes without fail, while hardly anyone will find themselves attaining to an office in a church if they make it known they basically do not celebrate this "holy celebration of obligation," and thus it is a form of legalism, regardless of denials of this reality.
And which as an event is `essentially akin to engaging in the same adoptive tactic of Israel of old, who, when not actually nationally engaging in idolatry, usually attempted to turn "high places" of pagan worship into venues of worship of Yaweh. But which, rather than destroying such as commanded, perpetuated the existence of these sanctified places or imitated them:
'And Jeroboam ordained a feast in the eighth month, on the fifteenth day of the month, like unto the feast that is in Judah, and he offered upon the altar. So did he in Beth–el, sacrificing unto the calves that he had made: and he placed in Beth–el the priests of the high places which he had made. So he offered upon the altar which he had made in Beth–el the fifteenth day of the eighth month, even in the month which he had devised of his own heart; and ordained a feast unto the children of Israel: and he offered upon the altar, and burnt incense." (1 Kings 12:32-33) "Nevertheless the people did sacrifice still in the high places, yet unto the Lord their God only." (2 Chronicles 33:17; cf. 1Kings 15:14)
Despite such commands as, "Ye shall utterly destroy all the places, wherein the nations which ye shall possess served their gods, upon the high mountains, and upon the hills, and under every green tree: And ye shall overthrow their altars, and break their pillars, and burn their groves with fire; and ye shall hew down the graven images of their gods, and destroy the names of them out of that place." (Deuteronomy 12:2-3) "Thou shalt not plant thee a grove of any trees near unto the altar of the Lord thy God, which thou shalt make thee:" Deuteronomy 16:21)
And perpetuating the existence of these sanctified places or imitating them easily enabled them to revert back to their original idolatrous purposes when Israel backslide once again. (And he sacrificed and burnt incense in the high places, and on the hills, and under every green tree: 2 Kings 16:4; And there they burnt incense in all the high places, as did the heathen whom the Lord carried away before them; and wrought wicked things to provoke the Lord to anger: 2 Kings 17:11; cf. 1Kings 12:31; 13:33; 14:23; 2Kg.15:35; 16:4; 17:10-19, 31-34; 2 Chronicles 21:11; 28:4; Isaiah 57:5). However, in a more complete revival then the high places were destroyed (2 Chronicles 17:6; 31:1; 34:3) consistent with such commands as Dt. 7:5.
The church began as a new creation, not a reformation, and does not need help from distinctively pagan rituals or celebrations (Merely using such as points of references, as with the names of months, is not the same as hijacking a pagan season of devotion by making it a Christianized holy season and day of obligation, vs abandoning it to die.) And the church is called to put to death the flesh and the religion thereof, which includes man's ideas of accommodating culture in religious syncretism.
Instead, believers are to worship in Spirit and in Truth under the New Covenant in which there is no liturgical calendar and the only day the NT church is recorded as specifically meeting on was the first day.
Thus, rather than being a "Grinch," Christians are free to worship the Lord, including celebrating the Lord's birth, any time, as the Lord leads (John 3:8; Rm. 8:12) as is the case in all areas of personal liberty, without essentially requiring it, while observing the annual celebration that Catholicism began is essentially a affirmation of that system, whose distinctive teachings are not manifest in the only wholly inspired substantive authoritative record of what the NT church believed (which is Scripture, in particular Acts through Revelation, which best shows how the NT church understood the gospels).
