The Noble Qur'an states: "The Messenger has believed in what was revealed to him from his Lord, and [so have] the believers. All of them have believed in Allah and His angels and His books and His messengers, [saying], "We make no distinction between any of His messengers." And they say, "We hear and we obey. [We seek] Your forgiveness, our Lord, and to You is the [final] destination.""
[2:284 from the Noble Qur'an]
Muslims must not make any distinction between any of their prophets (peace and blessings be upon them), and if they do so, then they have not abided properly and followed the characteristics of the believers mentioned in this verse. However, Prophet Muhammad (may Almighty God bless him and grant him peace) is our prophet and we must love him more than everybody else. But yes, I get your point, us Muslims should defend all the prophets of God (peace and blessings be upon them) when one opposes them.
Us Muslims should, God willing, give good examples on our religion and always act wisely and adapt exalted standards of character like the Prophet of God (may Almighty God bless him and grant him peace) had done.
In addition, if we were to preach to non Muslims, we should do so with wisdom and fair judgement, as the Almighty had instructed in His saying, "Invite to the way of your Lord with wisdom and good instruction, and argue with them in a way that is best. Indeed, your Lord is most knowing of who has strayed from His way, and He is most knowing of who is [rightly] guided." [16:125 from the Noble Qur'an]
Best regards, Ramzi.