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"It's a sin for a Catholic to worship alongside heretics."

Really? Why does the Church marry Catholics and non-Catholics? It seems they are to worship God together --- at their Nuptial Mass at least, and daily, we hope, as long as they both shall live.

Way back in NT days, St. Paul recognized the marriages of Catholics and non-Catholics. I don't recall him forbidding them to pray together.

Don't ask me; I'm just a Catholic laymen.

Why don't you ask a Catholic pope?

10. So, Venerable Brethren, it is clear why this Apostolic See has never allowed its subjects to take part in the assemblies of non-Catholics: for the union of Christians can only be promoted by promoting the return to the one true Church of Christ of those who are separated from it, for in the past they have unhappily left it. To the one true Church of Christ, we say, which is visible to all, and which is to remain, according to the will of its Author, exactly the same as He instituted it. During the lapse of centuries, the mystical Spouse of Christ has never been contaminated, nor can she ever in the future be contaminated, as Cyprian bears witness: "The Bride of Christ cannot be made false to her Spouse: she is incorrupt and modest. She knows but one dwelling, she guards the sanctity of the nuptial chamber chastely and modestly."[20] The same holy Martyr with good reason marveled exceedingly that anyone could believe that "this unity in the Church which arises from a divine foundation, and which is knit together by heavenly sacraments, could be rent and torn asunder by the force of contrary wills."[21] For since the mystical body of Christ, in the same manner as His physical body, is one,[22] compacted and fitly joined together,[23] it were foolish and out of place to say that the mystical body is made up of members which are disunited and scattered abroad: whosoever therefore is not united with the body is no member of it, neither is he in communion with Christ its head.[24] Pope Pius ; MORTALIUM ANIMOS

8. This being so, it is clear that the Apostolic See cannot on any terms take part in their assemblies, nor is it anyway lawful for Catholics either to support or to work for such enterprises; for if they do so they will be giving countenance to a false Christianity, quite alien to the one Church of Christ. Shall We suffer, what would indeed be iniquitous, the truth, and a truth divinely revealed, to be made a subject for compromise?

MORTALIUM ANIMOS

Although you are correct that this is not the topic of the OP, you will find that Church teaching regarding these mixed unions was very different pre-Vatican II....I know you are surprised to hear that. ;-)

http://www.newadvent.org/cathen/09698a.htm

A Nuptial Mass for these unions would have been unheard of.

Way back in NT days, St. Paul recognized the marriages of Catholics and non-Catholics. I don’t recall him forbidding them to pray together.

I think Paul was talking to the believers, you can call them Catholic and that is fine.

But if we are quoting the scriptures i believe we should quote them correct.

We have so many people on these threads that does not give a dam what the Bible actually says but plays with words to try and get it the way they want it.