"Religion of Peace" - My Ass!

[Muslim Scholar]

Every human is equal and has the equal rights, which may be hard to understand for a person being so backwards he supports slavery.

That's your problem
You put premises and consider them as facts
No, not all people are equal (even in a secular system)

According to Islam people are not equal, God gave each individual some talents, weaknesses and bounties
God will expect every person to use what he got to obey God
A poor person won't be treated as a rich person (God will expect a rich person to help people more and give charity, etc.)
God treat people with Justice not equality

A believer will not be treated as a non-believer (in this life or the hereafter)
This conform with the concept of good and bad,
The point is, If Islam is the true religion it makes absolute sense
If not it won't make it more false
I.e. you cannot use it as a refutation of Islam

And therefor deserves to be destroyed.

From the point view of non-Muslims, yes and God wanted you to try!