If your problem is that your mother is trying to impose her beliefs on others, then trying to impose your beliefs on her does not seem likely to a successful or constructive way of resolving the issue.

Rather than preaching to her, perhaps it would probably be more productive simply to discuss the difficulties you are having, and learn to live with each other. This can work. My wife's brother and his wife are Jehovah's Witnesses, in fact he is a minister or whatever the JW version of that is. The rest of my wife's family comprise a few quietly practising Catholics, and the majority firmly non-religious. Since the necessity of active evangelism is a core belief of JWs, you might think that was a recipe for family conflict. But it has been put to him that if he wants any kind of polite relationship with his relatives, he has to keep his mouth shut about religion when in their company. He has the good sense and common humanity to observe this.

There's not much you can "do about" people "seeing the light". They're most unlikely to change their mind because of arguments you put to them. I used to study with this guy. He had a presitigious research fellowship in economics at Oxford University, and was on his way to a glittering academic career. His change of direction was deeply regretted by his eminent colleagues, one of whom now has the Nobel Prize, but they plainly didn't prevent it.
http://www.stpauls.co.uk/page.aspx?p...lang=001lngdef

And this guy was once a close friend of mine. He was a noted hedonist at Oxford, and was pursuing a career as a socialist politician when we lost contact. He was once pictured scantily clad in compromising posture (with his own consent) in a top-selling Sunday scandal-sheet. When I tracked him down more than a decade later, I discovered he was doing something very different. When we did meet up, but I regret to say I couldn't cope with it and was very rude to him. Not mature, helpful or sensible of me, and I feel very embarrassed about it.
http://www.stpauls.co.uk/page.aspx?p...lang=001lngdef
(It isn't very obvious from the link, but he is a Catholic priest.)