That is very true, they try to put every one in the same basket, but that is not what Jesus preached.
Mathew 7:6
Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
The dogs and pigs are unbelievers and trying to preach Gods holy word to them is as useless as giving something holy to a dog or pig.
I reject the notion that God regards dogs and pigs in such low esteem; At least the dogs I've dealt with compared to many people over my long life.
I can't speak about pigs; at least not about the four-legged variety.