If a git-based project it maven module and it has some parent (like eap quickstarts available at https://github.com/jboss-developer/jboss-eap-quickstarts) it is not possible to deploy such a project. There is an error in New OpenShift Application wizard telling that a project is not git project, although it is. There was similar issue with OpenShift 2 and with deploying projects which did not have .git folder in itself but it was in parent. See following screenshot: