Every non-radical Islamist, non-liberal, non-communist non-socialist, decent human person can sign the above, if you eliminate the underlined parts. The reason why you have to eliminate that part is because it is indifferentism a mortal sin, it is condemned in scripture, and a dogma of the Catholic Faith. The Protestants, Orthodox, and Catholics who disagree with each other on this point do so out of CONVICTION, the absolute belief that the other will not be saved in his belief, therefore, they are trying to save their eternal life. That conviction is a sign of true love. Indifferentism is a sign of loss of conviction, and thus loss of any real faith.
When the real bullets start flying you will find that people of conviction, make the best allies and soldiers, even if they are of a different faith.
So far, so good...
the absolute belief that the other will not be saved in his belief,
No, that's not why I engage in apologetics with non-Catholics.
I make no decision about their eternal destination. That's for the Almighty to decide. Most of my discussions with them involve me explaining Catholic doctrine after it has been distorted or attacked. It's not about the person who's engaging me in dispute. They already know the Catholic point of view in most cases and have rejected it.
It's about third parties. It's simply about ensuring that any lurkers of good will understand true Catholic teaching.
.... therefore, they are trying to save their eternal life. That conviction is a sign of true love......
That's a silly assumption. Nothing more.
When a Muslim places his scimitar to your throat and screams "convert or die", you think he's doing it out of true love?? You think he truly cares about your eternal salvation? After all, there's nobody more "convicted" than a Muslim, is there?
The real reason is hate fueled by an infernal pride. It's the belief that your faith is evil and that those who follow it and profess it are evil too. Therefore, your faith must be destroyed and if you attempt to defend it, then you must be destroyed too, because, (the assumption goes) that's what God wants. That's where the pride comes in. I speak for God.
There's a word for that. It's called fanaticism.
It's the same with some non-Muslims on these boards.
The aim is not to save. It's to destroy.
I am not denying that there are differences between Christians.
I should have said “Although we have some differences, I consider Orthodox Christians and Protestants to definitely be Christian.”
However, I am just suggesting that we not be as hostile to each other. You may have missed it, but some of these religious threads are truly disgraceful.