16. Should we not encourage Muslims to open communication with other communities?

Yes, this is definitely required. When the Prophet went to Madinah, half of the population comprised of Jews. The direction of prayer for the Jews was not the Kabah, rather it was facing Jerusalem. The Prophet adopted the Jewish qiblah for the Muslim prayer as well. Today, education is secular and the state too is administered along secular principles. Why do Muslims not accept this? If you do not change now, you shall have to pay the price of being called backward.