dear brother salamu aleikum
I find your questions so interesting! You know, by us at home, there is already crashing, when my kids want to celebrate birthday. I as an ex-Sunnistin it banned my children earlier. Today I find nothing bad here. The children delight in the sweets (and I) and have a feast. It has nothing to do with religion yes we could argue most, as yet another year has passed and we are getting closer to death, we should not celebrate and cry more, which is probably correct, but whether the children understand that?
Something else in my opinion it, when idols are worshiped is through celebration of birthdays or death days or memories of massacre-The problem that I see with this is, that, firstly, these data and the events are uncertain, we do not know
if they and
when they have even taken place. In addition, a Celebration of the birthday of Saints, Prophets and others, may bring us closer to the danger of idolizing. So I would omit the celebration of things that are related to the Deen, but get no support from the Koran, rather . This is my own view.peace.
(because you don't know, i'm actually motherlanguage German. so excuse the mistakes in my writing