Many people feel the need to believe in something which extends beyond physical reality and that's the reason we have freedom of religion.
Time again history has shown though that religions often tend to go overboard in terms of violence so most modern societies have taken a pragmatic approach to offer freedom of religion under certain checks (i.e. not infringing on the freedoms of others from a secular perspective).
That said Einstein believed in god so don't belittle someone because of their religion and most importantly don't let fear take over your humanity (most people never got asked if they wanted to be "a muslim", "a christian" or "a jew").
What we need is more dialogue, not wars - those usually just create even more suffering and pain.
Talk to people - especially to the ones you don't feel comfortable talking to - we are all together on this pale blue dot.