Probably the most often spoken prayer in Christianity is the Lord's Prayer from Matthew 6:9–13: "Our Father in heaven, hallowed be your name. Your kingdom come, your will be done, on earth as it is in heaven. Give us this day our daily bread, and forgive us our debts, as we also have forgiven our debtors. And lead us not into temptation, but deliver us from evil." Why must we ask God to not lead us into temptation when it’s clear He Himself doesn’t tempt us? This prayer is a cry for God to guide and protect us from situations where we would otherwise be tempted to sin. It’s a cry for Him to deliver us from evil and show us the way out (1 Corinthians 10:13). God desires to make us holy as He is holy; He does not cause us to fail.
Why would we need to ask God to refrain from doing something He wouldn't do? Our prayer to God to "lead us not into temptation" is a plea for God to protect us, to guide us around situations and circumstances that may lure us into ungodly action. We may read it as Jesus teaching us to pray that God will not allow or permit us to be tempted. God will certainly never author temptation to sin, but He does allow it. Even though we know that God is faithful to provide a way out of temptation if we will take it (1 Corinthians 10:13), our prayer is often for Him to keep us from it all together. There are certain places, people, and circumstances that seem to be dangerous to us, in terms of interrupting our desire to honor God. We ask God to help keep us clear and to set our eyes on Him so we will not be tempted to stray. We need His wisdom and guidance. Our prayer is that we submit ourselves to God's will. As we cede control to God, we ask Him to keep us protected ("deliver us from evil") and give us the strength we need if temptation is allowed.