If I make a certain object; for example, a cup, can I say that I 'created' a cup? Or is it considered as interference with the matters related to Allah's Names and Attributes?
You should not use the word 'create' because the act of creation is attributed to Allah (Exalted be He) alone Who says,
Allâh is the Creator of all things
Rather, you are advised to use 'made' and preferably add 'by the Power, Might, and Will of Allah.'May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.