D'varim / Deuteronom 4:39 says loud and clear that there is no other G-d. Hashem is the only one.
"And you shall know this day and consider it in your heart, that the L-rd He is the G-d in heaven above, and upon the earth below; there is none else." D'varim / Deuteronomy 4:39.
The definite article הָֽ ('ha") in front of the word "elohim" (a title used to describe G-d, false gods, angels and even humans who are mighty / powerful judges) makes the translation "the G-d." הָֽאֱלֹ-הִ֔ים. Here is the Hebrew:
וְיָֽדַעְתָּ֣ הַיּ֗וֹם וַהֲשֵֽׁבֹתָ֘ אֶל־לְבָבֶ֒ךָ֒ כִּ֤י יְיָ֙ ה֣וּא הָֽאֱ-להִ֔ים בַּשָּׁמַ֣יִם מִמַּ֔עַל וְעַל־הָאָ֖רֶץ מִתָּ֑חַת אֵ֖ין עֽוֹד׃
Translations tend to translate this as "He is G-d", but the text acutally says "He is THE G-d." -- that is to say, "the One and Only G-D".
D'varim / Deuteronomy 4:35 (four verses earlier) is even more explicit....
אַתָּה֙ הָרְאֵ֣תָ לָדַ֔עַת כִּ֥י יְיָ֖ ה֣וּא הָֽאֱ-לֹהִ֑ים אֵ֥ין ע֖וֹד מִלְבַדּֽוֹ׃
"You have been shown these things so you should know that HaShem is the the One and Only G-D and there is no-one else apart from Him" (D'varim / Deuteronomy 4:35
Again we have The definite article הָֽ ('ha") in front of the word "elohim" ("the G-d"), but we also have אֵ֥ין ע֖וֹד מִלְבַדּֽוֹ׃ - no one else apart from Him.
Sophiee Saguy has been countering false missionary claims about Judaism and the T'nach (Jewish bible) for nearly twenty years. You may find her on FaceBook and at the Messiah Truth forum.