if other Life is Discovered wouldn't this Pose a problem?

While I am certainly not an expert, I think that statements similar to these place to many restrictions on what forms life might take. If there is life out there, who says that it has to be anything like us (besides those requirements that would make it 'life')?------------------
He hoped and prayed that there wasn't an afterlife. Then he realized there was a contradiction involved here and merely hoped that there wasn't an afterlife.
- Douglas Adams, The Hitch Hiker's Guide to the Galaxy