What is the ruling regarding a 16-year-old friend's belief in the obligation of establishing a group for Da'wah (inviting to Islam), building an independent town, and restoring the glory of Islam, citing historical figures like Ertuğrul? And what is the ruling regarding his saying "Bismillah (In the name of Allah)" before predicting future events, along with a request for advice for both of us?

Calling to Allah does not require power and authority, but rather beneficial knowledge, gentleness, and patience in enduring harm. It is the mission of the prophets. It is advised to acquire religious knowledge, act upon it, then call to Allah with gentleness and patience, adhere to the obligatory acts, and increase in supererogatory acts to attain Allah’s love. As for claiming knowledge of the unseen, it is false, and none knows it save Allah.