Is calling the non-Muslim a "disbeliever" a derogatory term?

Does the Christian not consider the Muslim a disbeliever, for instance, because he does not believe in the Trinity, and that he will not be admitted to the Kingdom of God except through having faith in it? "Disbelief" is a term that means denial of the truth, and the truth for the Muslim is represented in Tawhīd (monotheism), and for the Christian it is the Trinity.

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Some of the proofs indicating Allah's communication with His creation through revelation are:

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One of the general rules of Islam states that wealth belongs to Allah and people are entrusted with it and that wealth must not circulate only among the rich. Islam forbids the act of hoarding wealth without giving the poor and the needy a small share of it through Zakah, ...

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As an example to make things clear only, bearing in mind that Allah has the most highest of attributes, when man uses an electronic device and controls it from outside, he by no means is within the device.

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Everything in the universe falls under the control of the Creator. He alone possesses comprehensive and absolute knowledge, and the ability and strength to subjugate everything to His will. The sun, the planets, the galaxies all function thoroughly since the beginning of the creation, and these same thoroughness and ability ...

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Is calling the non-Muslim a "disbeliever" a derogatory term?