Is it permissible to say that Allah Almighty has created other planets unknown to us, inhabited by living beings, or does this contradict religion?

It is not possible to definitively assert the existence of living beings on other planets due to the lack of scientific evidence or religious text confirming it. However, merely believing in the possibility of their existence does not affect one's faith. The Qur'an mentions the existence of multiple planets in the universe, and that they will be scattered on the Day of Resurrection.