That Christians pray before dinner is not to worship,practise the magic,praise the merit or chant the spell.
They do not need these at all.We learn from the Bible that all things are created by God and bestowed by God.
As sons and daughters of the God,we should not be ungrateful people.
Therefore,we should pray before dinner and this is for the purpose of thanksgiving.
From the lessons we learnt ,we should not only thank the God.
That is what the Bible called " Be thankful in all things" .