What is the ruling on declaring someone who does not pray an infidel, given that I said to him: "You have not an iota of reverence for Allah in your view; had you revered Him, you would have prayed. Therefore, you are an infidel because you do not pray"?

One who abandons prayer, never performing it, is considered a disbeliever, whether they abandon it out of denial or out of laziness. This is the more correct view among scholars. Issuing a judgment of disbelief against a specific person requires certainty and knowledge of their situation; conjecture is not permissible in this regard. One whose Islam has been established with certainty cannot be excluded from it except with certainty. A person who abandons prayer does not hold reverence for Allah in their heart, because prayer is the pillar of the religion and the dividing line between Islam and disbelief. The true testimony of "La ilaha illa Allah" (There is no god but Allah) compels its possessor to fulfill obligations. One who consistently abandons prayer is a disbeliever, and there is no difference between them and one who prostrates to an idol. Some scholars have held that one who abandons prayer out of laziness is committing a grave sin, and they considered this a minor disbelief, but this view is not supported by evidence. The ruling for one who abandoses prayer due to negligence, intentionally, and with indifference is the same as the ruling for one who denies its obligation, according to the sounder of the two scholarly opinions. The differences among scholars must be taken into account, and one should show respect in matters of disagreement. Not everyone is bound by what some individuals deem correct, and the advisor should be gentle and wise in their call.