Timing belt knock

I was replacing the timing belt, water pump, tensioner and pulled.

All had been replaced and torqued down to correct to specs. I hadn't rotated the engine in the opposite direction of its rotation as its an interference engine. I had the marks on the crankshaft and camshaft marked liked up correctly and was watching a video on changing the timing belt for this particular model and year and followed the directions exactly.I had spun the engine using the camshaft the the appropriate marks. I haven't torqued down the Cam-bolt yet, it was hand tight. I turned the engine on to test it, it ran very rough however I thought it was because I removed an engine mount. I replaced the engine mount and ran the engine again, it still ran rough however before I could figure out how to fix it the engine made a loud knock sound and shut off. The fuel pump primes and the starter goes however I cannot start the engine and the cam and crank shaft don't spin. I can manually spin the camshaft bolt without it spinning the Camshaft. Did I ruin my engine?