Leaving aside the religious question, I believe interstellar travel is well within our capabilities right now but it would take a level of cooperation beyond anything the world has ever seen.  I'm thinking of generation ships here, btw, not some pie in the sky FTL drive or space warp technology.  

As to why aliens have never visited/contacted us:

We're not interesting enough or we're too far off the beaten track to make it worthwhile.  I have a feeling any serious undertaking would most likely go toward the galactic centre, where there seems to be a lot more fun stuff happening.   I know I'd probably do the same, given the chance.

Coppula eam se non posit acceptera jocularum.

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