Is it permissible for a non-specialist to watch videos of the Christian religion or their worship, in order to be certain of the truth of the Islamic religion?

It is not permissible to deliberately watch Christian rituals and acts of worship merely for entertainment or curiosity, due to the Almighty's saying: "And He has already revealed to you in the Book that when you hear the verses of Allah being denied and ridiculed, do not sit with them until they enter into another conversation. Indeed, in that case, you would be like them. Indeed, Allah will gather the hypocrites and disbelievers in Hell all together." However, if there is a benefit or advantage in watching, such as contemplating the blessing of guidance to Islam, then there is no harm in it for one who is secure from temptation and confusion. Otherwise, it is not permissible, as a preventive measure.