LOLz! If you presume to declare that the Dems have no diversity you're definitely going to have to pay attention to the whole DNC convo; unless and until you do, you are not in any position to judge. The DNC is inclusive of all religions including atheists, which the RNC is not, and as you can see, the atheists did get significant say before they lost that platform tussle. Are they going to defect to the Republican camp? Not only no, but HELL NO.
I take it you also didn't catch that closing ceremony where the evening benediction was conducted by a rabbi.
Yeah--you have no basis to claim either presence or absence of diversity of any sort in the DNC. You didn't even notice that the Cherokee Nation sent delegates to cast Oklahoma's votes for Obama, not anyone of European stock. Picture this: Oklahoma's delegation from the Cherokees nominating the first Cherokee President of the United States. Sweet irony, that.