Sigh. Again, you could do a little thinking of your own on this and some research into what you do not understand. 

You may find, for instance, that the "IGWT" on the coins was found to be more secular than religious by a federal judge, which is why it is still allowed to remain on our coins. Read it again: it's there specifically because it is NOT religious. 

You might also find that the use of the word "god" by the "founding fathers" does not mean what you think it means.