"Therefore to lead a calm life, always wet your tongue reciting phrases of praises to Allah SWT. The 'kalimah' (word) God could not all all be translated to Allah. The word 'God' could be in singular or plural form and have sexes such as God and Goddess. But the 'kalimah' Allah has the meaning of 'tauhid' monotheism in it. We acknowledge Allah SWT's oneness...its 'mustahil' (impossible) to be two or three.
So to Muslims please exclaim 'Ya Allah' because its meaning is different from 'Oh my God' (OMG). Ones reciting 'Ya Allah' would have Allah SWT's bounties and huge rewards in this world whats more in the Hereafter. So, recite 'Ya Allah'...is it too difficult to recite it compared to OMG?
YES just stick to 'Subhan-Allah' or 'Ya Allah' or 'Astaghfirullah' or 'Allahu Akbar' or the likes, crying it out loud depending on the situation. Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad s.a.w. and upon all his Family and Companions.