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On face value, given that theists have a reputation of lying and deceiving more than any other groups in society, one would have to say "No". But then, that would be a bit too judgmental since there are varying degrees of religiosity.
* Most people who say that they believe in God give their religion no more than lip service. You would consider these people as being no more or no less trustworthy than anyone else in mainstream society.
* Those who do sincerely believe in God however, are clearly deluded so that not only do they believe in lies and misinformation, they will invariably think and speak in such ways in order to justify their absurd beliefs (whether they be religious or otherwise).
[dɪˈluːʒ(ə)n] NOUN an idiosyncratic belief or impression maintained despite being contradicted by reality or rational argument, typically as a symptom of mental disorder.)
Religion was originally devised by those in authority to exercise control over the masses, the doctrines in religious texts reflect the political mood of the times in which they were written. Nowadays of course, there are very few religious governments in power. In modern, civilised society, anyone preaching such hideously cruel and untrue doctrines can easily be categorised as untrustworthy and anyone with a modicum of good sense would not go near these people (preachers)
with a barge poll.
Therefore, we could resonably conclude that, in order to determine whether someone is really a theist (and therefore more untrustworthy) one would need to ascertain whether or not that person firmly believes in God. Of those who say they are religious but are not really, we should check whether they are preachers or not.