I'm fishing around for other possible sources of confusion - why is it that you find it so hard to see this as a question? - and I found this:
Ed Martirosyan wrote: ↑January 5th, 2018, 8:23 pm
I do not see any interrogative pronouns in the Greek text nor the ἆρα (687 Strong's) to suggest the sentence to be in a question format.
Perhaps you think that questions in Greek normally require an interrogative pronoun? That's not the only thing that suggests a question in Greek. Here are a few more questions in very similar form to Matthew 7:22, again without the interrogative pronoun:
Matt.13.55 οὐχ ἡ μήτηρ αὐτοῦ λέγεται Μαριὰμ καὶ οἱ ἀδελφοὶ αὐτοῦ Ἰάκωβος καὶ Ἰωσὴφ καὶ Σίμων καὶ Ἰούδας;
Matt.6.25 οὐχὶ ἡ ψυχὴ πλεῖόν ἐστιν τῆς τροφῆς καὶ τὸ σῶμα τοῦ ἐνδύματος;
And questions without relative pronouns are quite common in New Testament Greek, this kind of negation is one of the more common ways to phrase a question. These examples are in Matthew because I started looking at the beginning.
Matt.5.46 οὐχὶ καὶ οἱ τελῶναι τὸ αὐτὸ ποιοῦσιν;
Matt.5.47 οὐχὶ καὶ οἱ ἐθνικοὶ τὸ αὐτὸ ποιοῦσιν;
Matt.6.26 οὐχ ὑμεῖς μᾶλλον διαφέρετε αὐτῶν;
Matt.6.30 εἰ δὲ τὸν χόρτον τοῦ ἀγροῦ σήμερον ὄντα καὶ αὔριον εἰς κλίβανον βαλλόμενον ὁ Θεὸς οὕτως ἀμφιέννυσιν, οὐ πολλῷ μᾶλλον ὑμᾶς, ὀλιγόπιστοι;
Matt.10.29 οὐχὶ δύο στρουθία ἀσσαρίου πωλεῖται;
Matt.12.3 Οὐκ ἀνέγνωτε τί ἐποίησεν Δαυεὶδ ὅτε ἐπείνασεν καὶ οἱ μετ’ αὐτοῦ;
Matt.13.27 Κύριε, οὐχὶ καλὸν σπέρμα ἔσπειρας ἐν τῷ σῷ ἀγρῷ;
Matt.13.55 οὐχ οὗτός ἐστιν ὁ τοῦ τέκτονος υἱός;
Matt.13.56 καὶ αἱ ἀδελφαὶ αὐτοῦ οὐχὶ πᾶσαι πρὸς ἡμᾶς εἰσιν;
Or with Μὴ:
Matt.9.15 καὶ εἶπεν αὐτοῖς ὁ Ἰησοῦς Μὴ δύνανται οἱ υἱοὶ τοῦ νυμφῶνος πενθεῖν ἐφ’ ὅσον μετ’ αὐτῶν ἐστιν ὁ νυμφίος;
Matt.11.23 καὶ σύ, Καφαρναούμ, μὴ ἕως οὐρανοῦ ὑψωθήσῃ;
Matt.12.23!1 καὶ ἐξίσταντο πάντες οἱ ὄχλοι καὶ ἔλεγον Μήτι οὗτός ἐστιν ὁ υἱὸς Δαυείδ;
But you don't need negation to create a question without an interrogative pronoun:
Matt.11.2 Σὺ εἶ ὁ ἐρχόμενος, ἢ ἕτερον προσδοκῶμεν;
Matt.3.14 Ἐγὼ χρείαν ἔχω ὑπὸ σοῦ βαπτισθῆναι, καὶ σὺ ἔρχῃ πρός με;
Matt.9.28 καὶ λέγει αὐτοῖς ὁ Ἰησοῦς Πιστεύετε ὅτι δύναμαι τοῦτο ποιῆσαι;
Matt.13.51!1 Συνήκατε ταῦτα πάντα;
ἐξίσταντο δὲ πάντες καὶ διηποροῦντο, ἄλλος πρὸς ἄλλον λέγοντες, τί θέλει τοῦτο εἶναι;
http://jonathanrobie.biblicalhumanities.org/