As long as their blaspheme is not very direct or try to challenge your belief, you can ignore or just don't mind them. You should not fall for their fishing of attention by using religion. It's your religion so better keep it's for your self than try to correct someone on their belief as well.
You say it right.
It makes no sense to impose some religion on other people (because few people understand that all religions are equal and have one God and one aspiration).
In addition, there is freedom of choice, you can talk about something, but you have no right to force it.
But you can share Love with other people, because everyone will be better off from this. I mean, you can do good deeds yourself, support your loved ones, be honest with yourself and with people around you, and not succumb to the provocation of the devil in your head. It's not always easy at first when you realize that all the thoughts in your head are not yours. But you can direct your attention to positive thoughts. Then, when you learn to control your mind, you can begin to meditate (i.e. generally be able to turn off the flow of thoughts). Then, when you learn to turn off thoughts, you can already comprehend your spiritual beginning. And each time you will feel the freedom of the soul deeper and deeper.
And there is nothing in this material world that could at least 1% replace the spiritual.
Therefore, you are right, we don't need to impose our ignorance and faith on others, first of all we need to comprehend yourself.