Yes... low compression will cause a hard start. No compression has prevented starting in the past... one of my buddies didn't set their timing right, but the lack of compression was because of bent valves. Your timing must be set right. You set your fan to the TDC Mark and have your camshaft at it's TDC Mark. Best thing to do is google picture as they'll show what I'm talking about. If you've been trying to turn it over w/o timing set, it would run poorly or possibly not at all. At worse, the valves will be bent, with a greater risk w/an aggressive cam. You should always bar/turn an engine by hand if you've affected timing to ensure it's set right.
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