Amazing how you judge ALL Christians by the actions (or lack thereof) a few. Should we in turn judge ALL atheists by your actions?
Ok, on to your questions;
#1 - The fig tree was a moral lesson. Jesus knew there was no fruit on it, as Scripture clearly states that it was not the season for figs. He used it to show what will happen to "unfruitful" Christians, meaning those who do no good works in His name, or who do not teach others about Him. He also used a similar parable to illustrate this;
6 He also spoke this parable: “A certain man had a fig tree planted in his vineyard, and he came seeking fruit on it and found none.
7 Then he said to the keeper of his vineyard, ‘Look, for three years I have come seeking fruit on this fig tree and find none. Cut it down; why does it use up the ground?’
8 But he answered and said to him, ‘Sir, let it alone this year also, until I dig around it and fertilize it.
9 And if it bears fruit, well. But if not, after that you can cut it down.’”
He will periodically look at us to see if we have borne fruit (works) that bring Him glory, and if we don't after a time, He will withdraw from us and we will wither and become useless spiritually.
#2 - Jesus responded negatively to Mary to show that she had no influence over Him. Calling her "Woman" instead of "Mother" reinforced this point to her and those within earshot (his disciples).
He had compassion on the bridegroom at the wedding, as He knew that tremendous embarrassment would come upon the groom from not having had enough wine for his guests. So Jesus quietly and without fanfare provided wine for the groom.
Therefore He did this on His own, not because of any influence from Mary.
#3 - God cannot be tempted (tested might be a better word), but we can put temptation before Him. Here is an example;
15 Then the Pharisees went and plotted how they might entangle Him in His talk.
16 And they sent to Him their disciples with the Herodians, saying, “Teacher, we know that You are true, and teach the way of God in truth; nor do You care about anyone, for You do not regard the person of men.
17 Tell us, therefore, what do You think? Is it lawful to pay taxes to Caesar, or not?”
18 But Jesus perceived their wickedness, and said, “Why do you test Me, you hypocrites?
19 Show Me the tax money.” So they brought Him a denarius.
20 And He said to them, “Whose image and inscription is this?”
21 They said to Him, “Caesar’s.” And He said to them, “Render therefore to Caesar the things that are Caesar’s, and to God the things that are God’s.”
22 When they had heard these words, they marveled, and left Him and went their way.
We can tempt (or test) God by trying to force Him to do something. He cannot be forced to do anything as he is omnipotent. He warns us about being foolish enough to try, as we could bring Him to anger and He may punish us for our foolishness.
Israel learned this the hard way when they tested God after the Exodus, and wandered in the desert for 40 years as a punishment;
7 Therefore, as the Holy Spirit says: “ Today, if you will hear His voice,
8 Do not harden your hearts as in the rebellion, in the day of trial in the wilderness,
9 Where your fathers tested Me, tried Me, and saw My works forty years.
I have answered your questions. Your thoughts in return?