Ooops another long one...
Jetay, this is a wonderful question. I think gallen stated it best that you can not push belief on other people and I agree I know you are not doing this. It is a challenge at times though when you know you can help someone and you have nothing but a closed book to work with. Know this that the personal work you are doing IS having an effect on them. So you are helping them inadvertently shifting there energy to a positive awakening light. Reread gallens post it clarifies a lot.
Sometimes personal energy can be drained when we try to work outside ourselves by worrying about this, trying to change that or whatever. However, our personal energies grows in abundance as we take care of ourselves. This effect ripples outward and others pickup on it either consciously or subconsciously. So always look for what feeds the soul it is always the right path.
Baby steps are probably the key in a close minded world/environment. Focus on yourself while keeping your awareness alive for the signs in others for periodic open mindedness. Sometimes your job is as simple as planting a seed (with out attachment) here in there. Sometimes you see it will take hold other times it appears that it doesn’t but once planted it will grow. Sometimes you could be passing information subtlety to one person and others that are meant to here are getting it on another level. Caution is always warranted as you don’t want to offend or squash another’s belief so how you neutrally state something can be the key as well. Again these are not things you would actively peruse as this has a draining feel to it. As log as you are open to the signs the moments will come and openness will grow.
The unattached approach to providing seeds for change is important as you don’t want to get caught in an emotional battle of right and wrong when someone challenges you because of there belief on some issue. Any thing can be stated as a fact of what is or the possibility of what might be another way to viewing something more than what is black and white right in front of someone. A good come back to the doubting Thomas’es of the world is to take something (paper, pencil whatever) and let it drop before there eyes. Ask them what made that drop, gravity is usually the answer to which you reply can you see gravity. Can you see the air you breathe? What keeps the moon from crashing into the earth or spinning out into space, and so on. There are many things we can not explain yet they are there just the same. 
