Use dpkg -l | grep apache to see which packages are installed. If you could post that list, I could tell you which to uninstall.
Done...
Code
dpkg -l | grep apache
ii apache2 2.2.22-13+deb7u4 amd64 Apache HTTP Server metapackage
ii apache2-mpm-worker 2.2.22-13+deb7u4 amd64 Apache HTTP Server - high speed threaded model
ii apache2-suexec 2.2.22-13+deb7u4 amd64 Standard suexec program for Apache 2 mod_suexec
ii apache2-utils 2.2.22-13+deb7u4 amd64 utility programs for webservers
ii apache2.2-bin 2.2.22-13+deb7u4 amd64 Apache HTTP Server common binary files
ii apache2.2-common 2.2.22-13+deb7u4 amd64 Apache HTTP Server common files
rc libapache2-mod-fcgid 1:2.3.6-1.2+deb7u1 amd64 an alternative module compat with mod_fastcgi