Haven't heard that "God is on my side" argument don't think it has been used much since the Civil War years. That is about the time when that grand, old conservative, Abraham told someone who used that argument..that we should not be so concerned that "God is on our side"..so much as we should be concerned that "we are on God's side".
Today, old Abe would be a "conservative's conservative"..
So, how do we know if "we are on God's side" ? Easy question, do we agree with him..here's a "for instance" from past threads. We have been through the idea whether God is in favor of homosexuality, or not.
Many of us, concerned with souls, said it is a sin, which if persisted with, can endanger a person's very soul ! Others said it was perfectly fine..just another "choice" in lifestyle..
In( Amos 3:3) God asks the rhetorical question; "Can two walk together, except they be agreed" ? God answers his own question by explaining that If one doesn't agree with God, he cannot walk with God..
So what does God think about Homosexuality and can God find any agreement with those who endorse that perverse lifestyle ? Here are a couple explanatory verses:
(Leviticus 20:13 NIV)
13 “‘If a man has sexual relations with a man as one does with a woman, both of them have done what is detestable. They are to be put to death; their blood will be on their own heads."
AND;
(1 Corinthians 6:9-11 NIV)
9 Or do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor men who have sex with men
10 nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God.
11 And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.
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So what remains is, we should each ask ourselves; "Am I in agreement with God" ? Or am I taking the side of perversion... in rebellion against God ?