In 1 John, the Apostle tells us how we must "test the spirits" in these latter days in order to know the truth and that we must remember that God is love and we to must live in love for one another.
"Beloved do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world." (1 John 4:1)
How, you may ask can I know? Simple, if the prophet speaks of Christ coming in the flesh then he is from God, all others are from Satan.
A true, God-sent-preacher must profess that Jesus has indeed come in the flesh, a living man, and that He truly is the Son of God, that Jesus is both man and God, one in the same. If any preacher does not profess this then you should not listen to him nor assist him.
How can we know we are in the company of other true Christians?
"Beloved let us love one another, for love is from God, and whoever loves has been born of God and knows God." (1 John 4:7)
God's love was made manifest when he sent His only Son into the sinful world so that all humanity had the chance to live eternally with Him in heaven. The love of both the Father and the Son is so strong that Jesus died a cruel death on the cross for the sins of all people, forever.
Only those "of God" will show love to others when they are persecuting them, those of the world do not know the love of God and will not show Godly love to those who disagree with them."Whoever confesses that Jesus is the Son of God, God abides in him, and he in God." (1 John 4:15)
Each day we are to witness to others that Jesus is truly the living Son of God so they see the joy we have as we abide in Him. We don't live in a perfect world and we are not perfect so there will be trials and tribulations but we must do our best to hold true to the faith and promote the gospel of the Lord to others each day. Just saying "I pray you have a blessed day" is sometimes all it takes to help someone through a rough day, be an example of good for Christ.
"By this love is perfected with us, so that we may have confidence for the day of judgement, because as He is, so also, are we in this world." (1 John 4:17)
Residing in Christ gives us the peace of mind we need to have total confidence in the day of judgement and our place in it. Either eternal life or eternal punishment awaits all humanity. "Whoever believes in the Son has eternal life, whoever does not obey the Son shall not see life, but the wrath of God remains on him. (John 3:36)
The choice must be made by each. If you do not know Jesus Christ as your personal Lord and Redeemer, simply ask Him and He will save you.
May God bless you each day.