“Doctrine divides!”
Whenever you hear this it’s usually followed up with “we all worship the same God” and “can’t we all get along?”
Whenever the mantra “doctrine divides” is employed, it’s always with a negative connotation. But have you stopped to ponder why?
Allow me to submit for your consideration, that “doctrine divides” is actually a good thing–a positive thing. It’s true that “doctrine divides,” and here’s what it divides:
The ones just wanting to be fed from the ones willing to take up their cross.
The false conversions from the true conversions.
The ones under law from the ones under grace.
The swine from the pearls.
The profane from the holy.
The tares from the wheat.
The goats from the sheep.
The wolves from the flock.
The hirelings from the shepherds.
The “other gospels” from the one true Gospel.
The false christs from the one true Christ.
The darkness from the Light.
The lies from the Truth.
The myths from the facts.
The wicked from the righteous.
The wide gate from the narrow gate.
The broad road from the narrow road.
and
The many paths from the only Way.
Doctrine divides; doctrine divides; thank God Almighty, doctrine divides!
– The Pilgrim

Men tell us that our preaching should be positive and not negative, that we can preach the truth without attacking error. But if we follow that advice we shall have to close our Bible and desert its teachings. The New Testament is a polemic book almost from beginning to end . . . . It is when men have felt compelled to take a stand against error that they have risen to the really great heights in the celebration of the truth.
Your Wednesday sermon of the week is 

Modern American dating is no more than glorified divorce practice. Young people are learning how to give themselves away in exclusive, romantic, highly committed (at times sexual) relationships, only to break up and do it all over again. God never intended for His kids to live like this. And instead of stepping in and doing something, many Christian parents simply view these types of relationships as a normal and necessary part of growing up. Unless your child is wiser than Solomon, stronger than Samson, and more godly than David (all of whom sinned sexually), they are susceptible to sexual sin, and these premature relationships serve as open invitations. . . . Being involved in such exclusive relationships before you are ready to be married is like shopping without any money; either you will leave frustrated, or you will take something that doesn’t belong to you.
Our holy Lord requires absolute submission and obedience in all things, both in the inward life and the outward, even to “bringing into captivity every thought to the obedience of Christ” (2 Corinthians 10:5). Alas that this is so little insisted upon in a day when the high claims of the Savior are whittled down in an attempt to render His Gospel more acceptable to the unregenerate.
This is the face of a cold-blooded murderer of innocent, defenseless children.