In one word simply: Ignore them. There is nothing you can do to change others but yes there is so much you can do to change yourself.
Even if you worship him or not he was there, he will be there. Just like sun is not because of us, we are because of sun, else everywhere it will be darkness. If he can create/manifest everything than he can take care of such things, if and when needed.
Found this interesting article where a seeker asks Sadhguru about the importance of devotion, to which Sadhguru replies that being devoted is not about someone or something. Devotion is essentially an enduring sweetness of emotion, with which your body and mind will function at their best.
So Shiva doesn’t need your devotion. It is just that if you carry
devotion in your heart… What is devotion, let’s look at this. On one
level devotion means a certain sweetness of your heart. It’s the best
way to be for any human being. If you do not carry this sweetness in
your heart you will be… life will do things to you and you will become
bitter. ‘So should I be devoted to Shiva?’ It doesn’t make any difference to Him but if you are a devotee – devotion is another kind of intelligence which simple intellect is unable to understand. The nature of a rudimentary intellect is, if you want to know anything we have dissect it. Yes? If you become interested in somebody, dissect them. Well you don’t do it physically because the law doesn’t permit it but you mentally dissect them, isn’t it?
You can take clue from our own history, where the mughals tried to change everything and convert everyone to follow their belief. This they did for more than 1500 years, after them came the britishers who again tried their best to make things happen their way for more than 200 years...but finally what happened? We are still here going strong!