Hey Stephane
Glad you took the leap, and hope nobody bothers you about it. Honestly, they did us a favour when they announced that my (now) ex was No Longer One Of Jehovah's Witnesses™ because it freed us from the fear of being shunned. I honestly don't care if a JW shuns me, in fact I welcome it. My JW relatives have been fine, once they realized we were not going to try to change their minds about the JWs, and besides my parent sometimes needs help or just wants to keep in touch. JW stuff is a no-fly zone, I won't discuss anything related to it, *unless* they initiate the discussion. I keep it short and to the point, and then change the subject. They are beginning to realize that it becomes difficult to split hairs, so to speak, by including never-baptized non-believing siblings and excluding Inactive™ ones. Especially when they get 'forgotten' by their so-called Brothers™ and Sisters™.
Enjoy your Christmas lights. Enjoy the season. Putting up or having extra lights during the darkest part of the year is normal. It crosses all cultures, and perhaps has always been a way to ward off depression that tends to increase as the days have more darkness than light.