Christians, is it true that without Satan you wouldnt have any followers, the negative that creates your positive out-look?

No.  In my church, we'd rather teach about God's love and experiencing him for ourselves anyway.

No

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Not true at all.  Someone is a follower of Jesus Christ solely by the grace of God, certainly not because of Satan.

Without Satan there would be no sinners to begin with but if we’re discussing the concept of Satan for the purpose of intimidating people to become followers of the Church... there would be less but there would still be some.