Robert Morris, the founding pastor of Gateway Church in Southlake, Texas, one of the biggest megachurches in the country with an estimated weekly attendance of 100,000, has been accused of sexually abusing a woman when she was between the ages of 12 and 16, RadarOnline.com has learned. Cindy Clemishire, now 54, told The Dallas Morning News that the abuse took place in Oklahoma and Texas between 1982 and 1987. She said she met Morris in 1981, when he was a 20-year-old traveling evangelist who began preaching at her family’s church. At the time, he was married and had a young son, and their fami…