That is so not true. If he really thinks that, he's more deluded than he realizes, as is anyone who agrees with it.
He may be the head of all Catholics on Earth, but since Catholic does not by default equal Christian, he can lay NO claim to being the head of all Christians on Earth.
The head of the church is Jesus, not the pope.
Ephesians 5:23-32 23 For the husband is the head of the wife even as Christ is the head of the church, his body, and is himself its Savior. 24 Now as the church submits to Christ, so also wives should submit in everything to their husbands.
25 Husbands, love your wives, as Christ loved the church and gave himself up for her, 26 that he might sanctify her, having cleansed her by the washing of water with the word, 27 so that he might present the church to himself in splendor, without spot or wrinkle or any such thing, that she might be holy and without blemish. 28 In the same way husbands should love their wives as their own bodies. He who loves his wife loves himself.
29 For no one ever hated his own flesh, but nourishes and cherishes it, just as Christ does the church, 30 because we are members of his body. 31 “Therefore a man shall leave his father and mother and hold fast to his wife, and the two shall become one flesh.” 32 This mystery is profound, and I am saying that it refers to Christ and the church.
of course the head of the church is Jesus, we all know that, however what you refuse to admit is that the Pope is the Vicar of Christ on Earth...Christ isn't here in person right now, He, of course was, but he ascended into Heaven. He did , however, appoint Peter to head the church on earth and through succession, his followers. Since there is only one true christian church in the world, the Pope is the head of it. I do not deny that there are many denominations within the CXhristian church, but they are considered to be our separated brethren. We are not enemies, we are brethren....come back into the fold and we will again be as one. If you cannot rejoin us, please enumerate your objections to being Catholic and we'll see if we can overcome your protestations (note the word?)