The pope is not Jesus Christ.

The bible tells us Christians to come out and be separate.

2 Corinthians 6:14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? 15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? 16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. 17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you,

The pope will lead religions to come together. On the 25th, the pope will hold a Multi-religious service at 9/11 Memorial and Museum, World Trade Center, according to his schedule.

There is nothing wrong with caring for people of other religions. But praying together to multiple gods, is not Christian.