Stop the process of emotionally attacking

One of our relative is not feeling well since recently and the family are going in very bad trauma as recently, two people from the family are passed away during different incidents. Now, one can see how emotionally weak they might be during this situation, given they have kids who are still young and one of the main person of the family is ill. So, one religion have taken this as an advantage and gave some speech that they will do prayers for them and their God (are there different Gods who can do better than other!!!, I was assuming it is only one :-/) will save them. So, the couple converted into different religion and stopped celebrating the festivals of their religion. I am not against any religion and I do believe one should respect other religions and I don't differentiate as their God or my God. But, I didn't like this way of attacking people emotionally and try to convert them into one religion and put a hard and fast rule of not celebrating their own festivals!
My request to those fellows who choose to convert people's religion in this way: Please stop this nonsense advertising/promotion what ever you call. This is not the right way.