This is not permissible, as you would be aiding them to celebrate Christmas.

I work for a charity organisation in the UK and every year they do a “Christmas Toy Appeal”. Other companies donate toys and then these are distributed to destitute families with young children. I was given the responsibility to arrange which families should receive the toys, but I want to know was it permissible for me to take part in this?

Jobs | February 18, 2015 5:08 pm
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What is the ruling concerning teaching fitness classes with music? A sister who has become a full time student of knowledge is considering to start to work again as fitness instructor, which she has been doing for the past 15 years, before she converted to Islam, and teach classes with music. (That type of classes can’t be taught without music.) 
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I work in a company where entrepreneurs are given loans for business and I prepare their project reports without which they can’t get loan facility as it is considered to be an essential document for securing finance. I want to know whether my job is halaal or haraam? And in case its haram, can I continue working here till I get another job or I should quit? Is it permissible to use the salary which I have saved since I was not knowing about it being haraam earlier. So can I spend that salary on myself till I get another job?