There are many mindfulness techniques that do not involve religion. It is very effective after some practice.

Here is a good article on it >>> New to Mindfulness? How to Get Started | World of Psychology

One of my favourites is called, 'the eye of the storm.' Basically choose a nice safe spot where you know you will not get disturbed for at least 20 minutes. Sit or lie. Imagine that you are very safe. Imagine, gradually all around you a storm is brewing, a massive tornado where you are sitting in the middle of it. You are safe. Let the energy around you swirl around and around you for 5 minutes. You may feel some intensity as the energy swirls but you are safe and still. Then gradually rein it back in, imagine the storm gradually dying down, slowly dissipating. Breathe gently and imagine as it all comes to stillness once more. You are safe. This process should take around 20 minutes and takes practice.

There are many variations and CD's you can buy to talk you gently through it.