Pastor Robert Jeffress participates in the Celebrate Freedom Rally with then-President Donald Trump on July 1, 2017. Olivier Douliery-Pool via Getty Images A preacher at a Texas megachurch is refusing to offer his congregation religious exemptions to COVID-19 vaccine mandates. He told the Associated Press that there is no "credible religious argument" for turning down a shot. Religious exemption letters are becoming more widely used as a "loophole" to avoid vaccine mandates, the AP said. See more stories on Insider's business page. As Republican lawmakers rage against President Joe Biden's sweeping vaccine mandates, the Associated Press reported that religious exemptions