I agree Greg. I try to look past denominational lines (I even accept Roman Catholics if they are truly born again; I also read the "mystics", like Madam Guyon, Richard Rolle etc.) I don't care if someone is a Calvinist or an Arminian (or something in between), I don't care if they are pre, post or a-millenial, or pre, mid, or post tribulation. All I care about is that 1. People are born again and, 2. They are following the real Jesus.
The 2 major threats to the true church I see are,
1. The signs and wonders gospel. Jesus specifically warned that this would happen in the end times (Matthew 24:24), and that "a wicked and adulterous generation seeketh after a sign." (Matthew 16:4.) Phony christians can perform miracles (Matthew 7:22); even Judas performed miracles (Luke 10:17.) The false prophet in the great tribulation will use signs and wonders to deceive people (Revelation 13:13,14.) We are told we will know people by their fruits (Matthew 7:16), not the miracles they can (or seem to) perform.
Miracles are NOT the central focus of the gospel. All they do is point people to the One that can perform the greatest miracle, the regeneration of the spirit.
I praise and thank God for every miracle done by Him in His name. Believe me when I say I tread carefully on this subject. Any miracle my God does, I would never attribute to the devil's power.
2. The prosperity gospel. This self centered "gospel" that masquerades as christianity has infiltrated countries all around the world. Unsaved people mock the true gospel message because of this. We are commanded to separate ourselves from anyone preaching this message (1 Timothy 6:3-5.)
I know there are people that are truly following Jesus the best way they know how that are in churches that teach bad theology. Just look at Samuel being raised by the backslidden priest Eli. I love these brothers and sisters and try to gently point them to sound teaching.