There are two types of people who read this writing: (1) Christians, and (2) non-Christians.
This typology is not a value statement on Christians and non-Christians. Instead, it is meant to serve as a way of understanding that the prayer, “Lord, may those people who read this writing take your message seriously,” is applicable to the two types of people – to all people.
For the Christian, to be Christ like is a very serious thing, and the prayer reflects that it (i.e., one’s faith in and relationship with Jesus) is treated as such.
For the non-Christian, the message that Jesus has for you is of the utmost importance, and the prayer is that you find it so.
I am afraid that the prayer “Lord, may those who read this writing take your message seriously” may offend you, but the greater concern is that The Good News is not taken seriously.