God showed many signs throughout the Bible. In Genesis 24, we see an example of a person asking for a sign from God and God granting that request by showing a sign.
Genesis 24:1-27 (NIV)
24 Abraham was now very old, and the Lord had blessed him in every way.2 He said to the senior servant in his household, the one in charge of all that he had, “Put your hand under my thigh. 3 I want you to swear by the Lord, the God of heaven and the God of earth, that you will not get a wife for my son from the daughters of the Canaanites, among whom I am living, 4 but will go to my country and my own relatives and get a wife for my son Isaac.”
5 The servant asked him, “What if the woman is unwilling to come back with me to this land? Shall I then take your son back to the country you came from?”
6 “Make sure that you do not take my son back there,” Abraham said. 7 “The Lord, the God of heaven, who brought me out of my father’s household and my native land and who spoke to me and promised me on oath, saying, ‘To your offspring I will give this land’—he will send his angel before you so that you can get a wife for my son from there. 8 If the woman is unwilling to come back with you, then you will be released from this oath of mine. Only do not take my son back there.” 9 So the servant put his hand under the thigh of his master Abraham and swore an oath to him concerning this matter.
10 Then the servant left, taking with him ten of his master’s camels loaded with all kinds of good things from his master. He set out for Aram Naharaim and made his way to the town of Nahor. 11 He had the camels kneel down near the well outside the town; it was toward evening, the time the women go out to draw water.
12 Then he prayed, “Lord, God of my master Abraham, make me successful today, and show kindness to my master Abraham. 13 See, I am standing beside this spring, and the daughters of the townspeople are coming out to draw water. 14 May it be that when I say to a young woman, ‘Please let down your jar that I may have a drink,’ and she says, ‘Drink, and I’ll water your camels too’—let her be the one you have chosen for your servant Isaac. By this I will know that you have shown kindness to my master.”
15 Before he had finished praying, Rebekah came out with her jar on her shoulder. She was the daughter of Bethuel son of Milkah, who was the wife of Abraham’s brother Nahor. 16 The woman was very beautiful, a virgin; no man had ever slept with her. She went down to the spring, filled her jar and came up again.
17 The servant hurried to meet her and said, “Please give me a little water from your jar.”
18 “Drink, my lord,” she said, and quickly lowered the jar to her hands and gave him a drink.
19 After she had given him a drink, she said, “I’ll draw water for your camels too, until they have had enough to drink.” 20 So she quickly emptied her jar into the trough, ran back to the well to draw more water, and drew enough for all his camels. 21 Without saying a word, the man watched her closely to learn whether or not the Lord had made his journey successful.
22 When the camels had finished drinking, the man took out a gold nose ring weighing a beka and two gold bracelets weighing ten shekels. 23 Then he asked, “Whose daughter are you? Please tell me, is there room in your father’s house for us to spend the night?”
24 She answered him, “I am the daughter of Bethuel, the son that Milkah bore to Nahor.” 25 And she added, “We have plenty of straw and fodder, as well as room for you to spend the night.”
26 Then the man bowed down and worshiped the Lord, 27 saying, “Praise be to the Lord, the God of my master Abraham, who has not abandoned his kindness and faithfulness to my master. As for me, the Lord has led me on the journey to the house of my master’s relatives.”
In verse 14, we see that Abraham’s servant did not ask for some extraordinary sign, like fire to fall from heaven. What he asked for was to see some indication of the one who would make a valuable wife in that culture. A wife who was friendly, hospitable, and hardworking. The unusual circumstances regarding this union, ultimately proved that God had chosen Rebekah to be Issac’s wife.
Does this biblical example teach us a fail-proof method of knowing God’s will? No, I would say. God promises us His guidance and his presence, but not necessarily external signs. He may choose to grant us events that, upon looking back, we can trace back to God and His leading. that should not be expected by us though. Much of God’s will is learned in the struggle of doubt and faith.
God wants us to live by the principles He’s laid down in the Bible. He is concerned about how we live as much as what we do. That doesn’t mean that what we do isn’t important, for our actions reflect our allegiance to God. But doing God’s will means living one’s life in obedience to all that He has revealed to us.
God also gives us His Word and the godly advice of others to discern His will. God blesses us all with so many gifts.
If we need to have a sign from God to believe in Him, then what we really should be questioning is not God, but our own faith.