What accounts for the continued spread of Islam in the modern era?

Answer 1

Many factors contributed to Islam expanding; mainly:

• Islam truthfulness
• Quran authenticity that remained unaltered through all the years since Quran revelation by God to prophet Muhammad (Peace be upon him)
• The personality of prophet Muhammad and his good morals and characters
• The scientific miracles in Quran scientific statements that their truthfulness had been validated only recently through the current advances in sciences and technologies.

Refer to questions below

Answer 2

Primarily the Quran proved authenticity and divinity in particular the scientific miracles in many Quran verses that its correctness and validity had been proved just recently through the advances in sciences, discoveries, and technologies although Quran was revealed from more than 14 centuries ago.