Believers know that Galatians 4:9 has nothing to do with Yehova’s feasts, but Satan's.
The abysmally lost believe as you say you do.
Months, seasons and years is Sun god worship. Days like christmas and easter are a big part of that.
As Peter said,
[14] Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
[15] And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;
[16] As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the scriptures, unto their own destruction.