I am not sure about which relgion Marx, Engels, Lenin, and Thelonius are speaking about.
We also say generallizing is not acceptable by many people.
Thelonius if there is a religion which tells you to be open minded and respect others and not hurt them then how it can poisons others?
The person who wants to live in shit, harm, and chaos will consider any thing which stops this shit, harm, and chaos as a poison and not only religion.