I believe you are making a gross misrepresentation of what Mary posted. Were she refering to Islam, you would be 100% correct. However, nothing prohibits one from trying to get another to join their beliefs. There is nothing coersive about what Mary wrote. The other person ALWAYS has the right to say thank you and walk away. Seems like you, OTOH, seek to have all religious discourse shut down - Freedom from religion for thee and no freedom of religion for me :)
Where you see virtue in Mary’s post...
I find it condesending and offensive.
First Amendment includes freedom of religion as well.
Trying to convert someone is rarely accomplished by starting out with insults.