@Rafidi , your arguments are only getting from bad to worse. Here for example, you are missing both the moon and the finger that is pointing at it, as the saying goes. While God does indeed protect the righteous, the purpose or end goal of that protection is 'securing and fulfilling the righteous in their righteousness', namely guarding them in and for their fulfillment of God's plan/will and their triumph as such over evil including its effect that is suffering. Such a fulfilment (with a triumph as this) logically involves (or presupposes) suffering (besides this being a logical entailment, try bringing forth a counter example of one figure from the scriptures of a righteous man/prophet that hasn't suffered at all in their life or mission), let alone the case of Christ for whom scriptures in both the old and new testaments lay out in prophecies and allusions his suffering mission which culminates in ultimate triumph.
While the righteous will be protected, it is essentially a protection against the 'snares of the devil' which are the actual hurdles that get thrown on the path of securing and fulfilling one's righteousness and triumphing over evil (being righteous or triumphing over evil is the end/purpose of having said protection in the first place), as was the case with Christ (e.g. Isaiah 53, Psalm 22, Zechariah 12 (12:10), John 7:30, 10:18-19, just a sample) who was guarded against evil as such until and right thru the time where 'his hour has come', to (or in a specific manner to) accomplish and fulfill his mission/righteousness (God's plan). As such, the cross was not God failing to protect Christ, but God's very success in this regard. Christ accomplishing his mission and triumphing over - and treading on - the serpent / lion's head, trampling it underfoot (
the 'lion with the serpent' imagery in the Bible alludes to the devil who is referred to as both the father of lies and the one who prowls around like a roaring lion looking for someone to devour), fulfills Psalm 91 itself, the Psalm which you,
in the footsteps of Satan who quotes verses of scripture out of their context and interprets/presents them in a manner that appears to contradict with other passages, are deceitfully - or ignorantly in your case I'd say - basing your feckless point on. And this is the case with every other prophecy and allusion concerning the suffering/triumphant Messiah.
Psalm 91:11 For He shall give His angels charge over you, To keep you in all your ways.
Psalm 91:12 In their hands they shall bear you up, Lest you dash your foot against a stone.
Psalm 91:13 You shall tread upon the lion and the cobra, the lion and the serpent you shall trample underfoot.
The refuting expended explanation above may be useful, interesting and fruitful for the ignorant who is genuinely seeking truth and understanding, but futile and unnecessary for the wicked (much less the damned) in whose case only a summary form of it would suffice for shutting them up (uttered with a divine writ), but not so for the one who is both wicked AND ignorant who will just keep on reiterating an invalid claim as one does a valid one no matter the corrective answer or explanation offered.
Matthew 4:5 Then the devil took Him up into the holy city, set Him on the pinnacle of the temple, 6 and said to Him, “If You are the Son of God, throw Yourself down. For it is written: ‘He shall give His angels charge over you,’ and, ‘In their hands they shall bear you up, Lest you dash your foot against a stone.’ ” 7 Jesus said to him, “It is written again, ‘You shall not tempt the Lord your God.’ ”
As is pretty much evident, Christ's summarily response strikes two birds with one stone. First, Christ was alluding to himself when he told Satan who was testing him "You shall not test the Lord your God", so right there the very scripture Satan was quoting rendered his attempt invalid. Second, trying to back God into a corner by our actions in order to force a desired result for oneself (in the spirit of 'my will, rather than thy will, be done'), 'compelling God to rescue us in a manner we want Him to rescue us in', or 'or trying to align Him to our will' under the presumption of His loving and caring nature or promises, reflects a mistrust in God's providential care/plan and thus also a need to test it, and would as such fall within the category of putting God to the test. God wants us to trust Him, not dare Him. Right there Christ was telling Satan that while scripture promises God will take care of him and protects him (the protection whose qualification and scope is highlighted in the rest of the passages of the same scripture), the same scripture also says one should not jump off a cliff just for the sake of proving to oneself God's promise (testing God in the process).
Ironically enough, in essence it is the prime temptation those of the Jews that rejected Christ fell into (as did Muslims centuries afterwards), and now after having jumped off that cliff they are still wrongly waiting for God to rescue them before they hit the ground definitively i.e. their doom (instead of acknowledging their error).