"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled." -Jesus H. Christ
You have tried this little trick before. You can't let what you saw on an atheist blog determine what you think.
You have to actually read what the rest of the Sermon on the Mount says, not just the snippet of it you plucked from an atheist blog.
In the Sermon on the Mount Jesus radically reinterprets the Laws of Torah to build them around the concepts of love and respect, and he says nothing about the ritualistic laws and holiness laws of Torah - clearly indicating he placed priority on the moral laws, and minimized ritual and holiness laws. In fact, Jesus and his apostles were frequently blamed for not following the Torah's laws of Sabbath or the laws of ritual cleanliness.
Lastly, Paul is the patron saint of basic Christian theology and practice, hands down. Epistle to the Romans clearly states that Paul is following the commandments of Jesus in saying that practicing universal love and respect is all you need to fulfill the moral law.