Different ideas about God are not necessarily mutually exclusive. Yes, this might drift into "postmodernism", but I happen to think many of the insights brought about in modern philosophy are not incorrect.
"Getting along" is about dealing in charity with our neighbors, to not misrepresent their beliefs and to understand them in the best possible light, and so on. All stuff drawn from the Decalogue as understood within our tradition.
A little bit of overreach on your part when drawing from the Reformed Catechisms/Confessions. We still maintain that ecumenism with Rome, who still maintain the anathemas of Trent against all Protestants and who still has "that man of sin" as head of their communion, is unacceptable.
a·nath·e·ma:
a formal curse by a pope or a council of the Church, excommunicating a person or denouncing a doctrine.
synonyms: an abomination, an outrage, an abhorrence, a disgrace, an evil, a bane, a bugbear, a bête noire;
adjectivesabhorrent, hateful, repugnant, odious, repellent, offensive
"the idea of a poem as a mere exercise is anathema to me"
CANON 9: "If any one saith, that by faith alone the impious is justified; in such wise as to mean, that nothing else is required to co-operate in order to the obtaining the grace of Justification, and that it is not in any way necessary, that he be prepared and disposed by the movement of his own will; let him be anathema."
CANON 12: "If any one shall say that justifying faith is nothing else than confidence in the divine mercy pardoning sins for Christ's sake, or that it is that confidence alone by which we are justified...let him be accursed"
Canon 14: "If any one saith, that man is truly absolved from his sins and justified, because that he assuredly believed himself absolved and justified; or, that no one is truly justified but he who believes himself justified; and that, by this faith alone, absolution and justification are effected; let him be anathema."
Canon 23: "lf any one saith, that a man once justified can sin no more, nor lose grace, and that therefore he that falls and sins was never truly justified; or, on the other hand, that he is able, during his whole life, to avoid all sins, even those that are venial, - except by a special privilege from God, as the Church holds in regard of the Blessed Virgin; let him be anathema."
Canon 24: "If any one saith, that the justice received is not preserved and also increased before God through good works; but that the said works are merely the fruits and signs of Justification obtained, but not a cause of the increase thereof; let him be anathema."
Canon 30: "If any one saith, that, after the grace of Justification has been received, to every penitent sinner the guilt is remitted, and the debt of eternal punishment is blotted out in such wise, that there remains not any debt of temporal punishment to be discharged either in this world, or in the next in Purgatory, before the entrance to the kingdom of heaven can be opened (to him); let him be anathema."
Canon 33: "If any one saith, that, by the Catholic doctrine touching Justification, by this holy Synod inset forth in this present decree, the glory of God, or the merits of our Lord Jesus Christ are in any way derogated from, and not rather that the truth of our faith, and the glory in fine of God and of Jesus Christ are rendered (more) illustrious; let him be anathema.
If the anathemas do not apply to you then by all means celebrate with Rome prayers or whatever.
Chapter 26: Of the Church
4. The Lord Jesus Christ is the Head of the church, in whom, by the appointment of the Father, all power for the calling, institution, order or government of the church, is invested in a supreme and sovereign manner; neither can the Pope of Rome in any sense be head thereof, but is that antichrist, that man of sin, and son of perdition, that exalteth himself in the church against Christ, and all that is called God; whom the Lord shall destroy with the brightness of his coming. ( Colossians 1:18; Matthew 28:18-20; Ephesians 4:11, 12; 2 Thessalonians 2:2-9 )
"…by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God. Remember ye not, that, when I was yet with you, I told you these things? And now ye know what withholdeth that he might be revealed in his time. For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way."
2 Thessalonians 2:3-7
Thomas Manton: It is a point very necessary to admonish and warn the faithful, that they be not circumvented with these delusions, and be found in the opposite state to Christ Jesus, and the interests of his kingdom. God hath blown his trumpet: Rev. xviii. 4, ‘Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues;’ God calleth his people out of spiritual Babylon; it is dangerous and unsafe being there. If we would escape Babylon’s punishments we must escape her sins, not live in that communion and society where there are such temptations to idolatry and other detestable enormities. It is disputable whether the errors of Popery be damnable, or there be any possibility of salvation in that religion. Some deny all possibility; others, abating from the rigour of that opinion, assert a very great difficulty: 1 Cor. iii. 13, ‘Saved as by fire;’ if so much Christianity left as to save them, it is with much ado. But the question is not about our benefit, but our duty; not whether possibly we may be saved? but what is the way the Lord will have us to walk in? And if there were possibility or probability of salvation in the way, in the general, yet there is very little or none for them that live in a known sin, and especially in a sin of such a dangerous nature as abetting an opposite faction to Christ, such as is that of Antichrist.[end quote]
Until Rome repents and retracts its anathemas Protestants should avoid ecumenism with Rome.
Yours in the Lord,
jm