You guys have to know that God excepts work , studying and the reciting [ repeting for example ( there is no god except for God ) , or something like that , and thats praying to God, but the actual praying is the greatest , and for christians i think praying for example out of church they pray befour going to bed or something and begin hoping for good to others and such , we have this too , but its not called praying , but the du'aa , but its also a prayer , the dua is called praying to God. and there is no limit or timing to when you can make a dua , so muslims can make a dua anytime anywher they want.