* Speaks on social values to Christian conservatives * Says he would be 'opposite' to Obama on Israel relations * Practices retail politics in rural Pennsylvania * Praises job creation at thriving specialty foundry By Ros Krasny CORNWALL, PA, June 16 (Reuters) - Republican Mitt Romney took time out on Saturday from a five-day tour aimed at shoring up support among small-town voters in battleground states to touch base with another critical party constituency - Christian conservatives - and include some tough talk on U.S.