What is the Shar'i (Islamic legal) opinion regarding the book "Islam Challenges" by Wahiduddin Khan, and is it permissible to read it?

The book "Islam Challenges" by Wahiduddin Khan is one of the best modern books for inviting people to Islam. It demonstrates that Islam is the true religion in a contemporary style. The book is characterized by the depth of its ideas and the strength of its arguments, indicating the author's knowledge and the soundness of his beliefs. Reading it is beneficial, especially for callers to Islam and those who confront false ideologies.