My predicition

[Heywood]

If aliens came to this planet for the first time proclaiming Allah is God and Mohammed is his prophet, I would suggest you start going to Mosque. My "threat" has nothing to do with Christian mindset. It has to do with a position that if aliens independently practiced a religion earthlings also practice, that would suggest to me that such a religion is divinely inspired. It is much more likely that Allah is God and Mohammed is his prophet than for the exact same religion to emerge on another planet as a matter of happenstance.

This is just my opinion of course.

The more parsimonious explanation would be that those aliens had been here 1400 years ago and started Islam.

One condition of the thought experiment is "aliens came to this planet for the first time"......so your explanation would not work.

If you want instead of aliens visiting, lets suppose you intercept radio signals from another planet, in another galaxy, which proclaims God to be Allah and Mohammed is His prophet.

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Is there any eventuality that wouldn't imply God is real? That's the problem. Anything and everything is good enough evidence for God, for someone who has already decided they want it to exist.

And no evidence is good enough for those who have already decided they don't want God to exist.